ACT 2020 December(D03) Math Question 5 Explanation - ACT Helper

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2020 December(D03) Math Question 5
Probability
- One Event
Probability
Choice A
$N u m b e r o f j u n i o r s = 9$
$N u m b e r o f s e n i o r s = 11$
As 1 senior is selected, so the number of seniors available for selection is
$N u m b e r o f s e n i o r s = 11 - 1 = 10$
$T o t a l n u m b e r o f m e m b e r s a v a i l a b l e = 10 + 9 = 19$
We have to find the probability of selecting a junior out of the remaining seniors and juniors:
$P r o b a b i l i t y o f s e l e c t i n g a j u n i o r = \frac{N u m b e r o f j u n i o r s}{T o t a l n u m b e r o f m e m b e r s a v a i l a b l e} = \frac{9}{19}$
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