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davistakeisha95
31.07.2019 •
Mathematics
Ahigh school class consists of 7 seniors, 10 juniors, 12 sophomores, and 11 freshmen. exactly 4 of the juniors are female, and exactly 2 of the sophomores are male. if two students are randomly selected from this class, what is the probability that the pair consists of a male junior and a female sophomore?
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Ответ:
1/13
Step-by-step explanation:
There exactly 7 seniors 10 Juniors, 12 sophomores and 11 freshman
in which 4 of the juniors are Female , and exactly 2 of the sophomores are male. Therefore,
10-4= 6 juniors are male
12-2 = 10 female sophomores
Total = 7+10+12+11= 40 students
P(male junior then female soph.)=![\frac{6}{40}\times\frac{10}{39}= \frac{1}{26}](/tpl/images/0155/7557/f7025.png)
P(female soph then male junior)=![\frac{10}{40}\times\frac{6}{39}= \frac{1}{26}](/tpl/images/0155/7557/45082.png)
Therefore the final answer will be = 1/26 +1/26= 1/13
Ответ:
the answer is 0
Step-by-step explanation: