ACT 2020 June(C02) Math Question 18 Explanation - ACT Helper

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2020 June(C02) Math Question 18
Statistics
- Mean, Median
Choice F
The mean is the average of the numbers.

The Median is the "middle" of a sorted list of numbers.

The mode is the number that is repeated more often than any other.
$6, 7, 7, 6, 8, 7, 8, 10, 9$
Rearrange the 9 scores in order.
$\to 6, 6, 7, 7, 7, 8, 8, 9, 10$ $M e a n = (6 + 6 + 7 + 7 + 7 + 8 + 8 + 9 + 10) \div 9 = 68 \div 9 \approx 7.55$ $M e d i a n = 7$ $M o d e = 7$
After correcting the 9th score to 10.
$\to 6, 6, 7, 7, 7, 8, 8, 10, 10$ $M e a n = (68 + 1) \div 9 \approx 7.66$ $M e d i a n = 7$ $M o d e = 7$
Only the mean is changed.
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