Probability

One Event

2010 June(68C) Math Question 1

1. The numbers 1 through 15 were each written on individual pieces of paper, 1 number per piece. Then the 15 pieces of paper were put in a jar. One piece of paper will be drawn from the jar at random. What is the probability of drawing a piece of paper with a number less than 9 written on it?

2021 April(Z04) Math Question 1

1. The 32-member French Club is meeting to choose a student government representative. The members decide that the representative, who will be chosen at random, CANNOT be any of the 5 officers of the club. What is the probability that Luis, who is a member of the club but NOT an officer, will be chosen?

2016 December(74H) Math Question 1

2010 December(69A) Math Question 1

2. A wallet containing 2 five-dollar bills, 9 ten-dollar bills, and 5 twenty-dollar bills is found and returned to its owner. The wallet's owner will reward the finder with 1 bill drawn randomly from the wallet. What is the probability that the bill drawn will be a twenty-dollar bill?

2017 June(74C) Math Question 2

2. The 35-member History Club is meeting to choose a student government representative. The members decide that the representative, who will be chosen at random, CANNOT be any of the 3 officers of the club. What is the probability that Hiroko, who is a member of the club but NOT an officer, will be chosen?

2017 April(74F) Math Question 2

2012 April(70G) Math Question 2

5. A wallet containing 5 five-dollar bills, 7 ten-dollar bills, and 8 twenty-dollar bills is found and returned to its owner. The wallet's owner will reward the finder with 1 bill drawn randomly from the wallet. What is the probability that the bill drawn will be a twenty-dollar bill? DO YOUR FIGURING HERE.

2017 April(74F) Math Question 5

2009 April(66F) Math Question 5

2020 July(C01) Math Question 5

2019 April(Z15) Math Question 5

5. A certain committee is composed of 9 juniors and 11 seniors. Two different members of the committee will be randomly selected for 2 different leadership roles. Given that the 1st member who will be selected is a senior, what is the probability that the 2nd member who will be selected is a junior?

2020 December(D03) Math Question 5

6. A bag contains exactly 18 solid-colored buttons: 3 red,
5 blue; and 10 white. What is the probability of
randomly selecting 1 button that is NOT white?

2019 June(B02) Math Question 6

2013 December(71E) Math Question 6

7. A bag contains 10 pieces of flavored candy: 4 lemon, 3 strawberry, 2 grape, and 1 cherry. One piece of candy will be randomly picked from the bag. What is the probability the candy picked is NOT grape flavored?

2015 June(73C) Math Question 7

2019 December(C03) Math Question 7

2010 April(68G) Math Question 7

2011 April(67F) Math Question 9

2009 December(68A) Math Question 10

10. Tammy will draft 1 player at random from a list of 20 players for her fantasy football team. Each player in the list plays only l position. The number of players who play a particular position is given in the table below. What is the probability that the player Tammy drafts will be a kicker or a receiver?

2016 December(74H) Math Question 10

2019 December(C03) Math Question 11

11. A bag contains 8 red marbles, 9 yellow marbles, and 7  green marbles. How many additional red marbles must be added to the 24 marbles already in the bag so that the probability of randomly drawing a red marble is 3/5 ?

2021 April(Z04) Math Question 11

13. A box contains 3 red, 2 white, and 5 blue beads, each of which is a solid color. Miguel will randomly remove 1 bead from the box, record the color of the bead, and return the bead to the box. Miguel will complete this process 50 times. How many times should Miguel expect to record a bead color that is NOT white?

2014 December(72G) Math Question 13

2010 June(68C) Math Question 14

14. A bowl contains 6 red beads, 8 black beads, and a number of green beads. There are no other beads in the bowl. The probability of randomly choosing a black bead from the bowl is 1/3. How many green beads are in the bowl?

2015 April(73G) Math Question 14

15. Miriam conducted a survey of the students in her 8th-grade class to determine which of 7 Olympic sports were the most popular. Each student who responded to the survey selected 1 Olympic sport as his or her favorite. The circle graph below shows the number of students who selected each of the 7 Olympic sports. A total of 40 students responded to the survey. To the nearest 0.1%, what percent of the students who responded to the survey selected Basketball?

2013 June(71C) Math Question 15

2019 April(Z15) Math Question 17

18. Lena will pick 1 card at random from a pack of 25 baseball cards. Each card features the fielding position for 1 of 25 different baseball players. Each player in the pack has only 1 fielding position. The table below lists the frequency of fielding positions in the pack. What is the probability that the card Lena picks will feature an outfielder or a pitcher?

2018 June(A11) Math Question 18

2012 December(71A) Math Question 21

21. A set of numbers consists of all the odd integers that are greater than 1 and less than 21. What is the probability that a number picked at random from the set will be divisible by 3 ?

2015 April(73G) Math Question 21

22. A physical education teacher recorded the distances, in
inches, that her students jumped during a long jump
lesson. The distances of 1 jump by each of the students
are represented in the stem-and-leaf plot below.

2019 June(B02) Math Question 22

22. Sets A, B, and C are defined below. A = {1, 2, 3, 4, 5, 6, 7, 8, 9} B = {2, 4, 6, 8} C = {4, 8} A number will be randomly selected from A. What is the probability that the selected number will be an element of C and an element of B ?

Sets

2020 December(D03) Math Question 22

23. Sets A, B, and C are defined below. A = {1, 2, 3, 4, 5, 6} B = {2, 4, 6} C = {1, 2}  A number will be randomly selected from set A. What is the probability that the selected number will be an element of set B and an element of set C ?

2021 April(D05) Math Question 23

24. The figure below shows 3 different views of the same fair cube. Each face of the cube has 1 design drawn on it. The cube will be rolled once. What is the probability that a face showing a star (*) will be on top?

2014 April(71H) Math Question 24

2019 April(B04) Math Question 24

25. At East High School, the 20 cast members of the spring musical sold 2 types of tickets—student and adult—for the Friday night and Saturday night performances. The price of each student ticket was $2 and the price of each adult ticket was $3. The table below gives the number of tickets sold, by type and by night. The stem-and-leaf plot below shows the number of tickets, regardless of type, sold by each of the 20 cast members. The auditorium where the spring musical will be performed has 10 seats in the 1st (front) row. Each row behind the 1st row has 4 more seats than does the row in front of it. Suppose 1 cast member will be picked at random from the 20 cast members who sold tickets to receive a prize. What is the probability of picking a cast member who sold more than 30 tickets?

2014 December(72G) Math Question 25

2018 December(B05) Math Question 25

26. A bag contains 16 red’marbles, 7 yellow marbles, and 19 green marbles. How many additional red marbles must be added to the 42 marbles already in the bag so that the probability of randomly drawing a red marble

2017 June(74C) Math Question 26

26. About 1.48 × 108 square kilometers of Earth’s surface is land; the rest, about 3.63 × 108 square kilometers, is water. If a returning space capsule lands at a random point on Earth’s surface, which of the following is the best estimate of the probability that the space capsule will land in water?

2021 April(Z04) Math Question 26

2019 April(B04) Math Question 27

2013 April(71G) Math Question 28

2019 June(72F) Math Question 29

2013 April(71G) Math Question 29

2013 April(71G) Math Question 30

2009 June(67C) Math Question 32

33. A package of candy contains pieces each of which is 1 of 6 possible colors: brown, red, green, yellow, orange, and blue. In each package, 1/3 of the pieces are brown and the remaining pieces have an even
distribution of the other 5colors. What is the probability that a piece drawn randomly from the package is red?

2021 June(D06) Math Question 33

2009 April(66F) Math Question 33

34. A bag contains several marbles. On 3 successive draws with replacement, a red marble is drawn from the bag each time. Which of the following statements must be: true about the marbles in the bag?

2018 April(A09) Math Question 34

34. To make a 750-piece jigsaw puzzle more challenging, a puzzle company includes 5 extra pieces in the box along with the 750 pieces, and those 5 extra pieces do not fit anywhere in the puzzle. If you buy such a puzzle box, break the seal on the box, and immediately select 1 piece at random, what is the probability that it will be 1 of the extra pieces?

2014 June(72C) Math Question 34

38. At a local post office, on average, 3 customers are in line when the post office closes each day. The probability, P, that exactly n customers are in line when the post office closes can be modeled by the equation P=. Given that e-3 0.05, which of the following values is closest to the probability that exactly 2 customers are in line when the post office

2015 June(73C) Math Question 38

38. One of the volunteers whose Sam77  test result was positive will be chosen at random. To the nearest 0.001, what is the probability the chosen volunteer does NOT possess Yq77 ?

2021 April(Z04) Math Question 38

2020 June(C02) Math Question 40

2012 April(70G) Math Question 43

44. A box contains a combination of solid-colored tickets: 1/10 of the tickets are green, 1/2 are red, 1/4 are blue, and the remaining 30 tickets are white. How many blue tickets are in the box?

2016 April(73E) Math Question 44

2010 December(69A) Math Question 46

2019 December(C03) Math Question 48

2019 April(B04) Math Question 49

2019 April(B04) Math Question 50

2019 December(C03) Math Question 50

52. A basket contains 10 solid-colored balls–2 blue, 3 red, and 5 green. Each ball has a single number printed on it. The blue balls are numbered 1 and 2 (each number is used once), the red balls are numbered 1-3 (each number is used once), and the green balls are numbered 1-5 (each number is used once). A ball will be drawn at random from the basket. What is the probability that the ball that is drawn will he red or have a 3 printed on it?

2018 April(A09) Math Question 52

2009 December(68A) Math Question 52

2020 July(C01) Math Question 54

56. At the school carnival, Mike will play a game in which he will toss a penny, a nickel, and dime at the same time. He will be awarded 3 points for each coin that lands with heads faceup. Let the random variable x represent the total number of points awarded on any toss of the coins. What is the expected value of x

2017 April(74F) Math Question 56

2018 December(B05) Math Question 56

59. The table indicates the grade (10 or 11) and high school (North or South) of the 270 students enrolled in Algebra II in the Green City School District.
Suppose 2 of these students will be chosen at random to represent the Algebra II classes at a local STEM (Science, Technology, Engineering, and Mathematics) event. Which of the following expressions gives the probability that both chosen students will be from the same grade and the same high school?

2021 June(D06) Math Question 59

60. A certain company has 120 employees, 85 of whom have business degrees. Of the employees with business degrees, 75 are certified public accountants (CPAs). There are 14 employees who are not CPAs and also do not hold a business degree. One employee of the company will be selected at random to be interviewed for a television news program. What is the probability that the selected employee will be a CPA ?
(Note: A business degree is NOT required to be a CPA.)

One EventProbabilityACT math questions

2010 June(68C) Math Question 1

2021 April(Z04) Math Question 1