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Vitek1552 [10]
2 years ago
8

In a class of 25 students, 13 have a brother and 9 have a sister. There are 7 students who do not have any siblings. What is the

probability that a student chosen randomly from the class has a brother and a sister?
Mathematics
1 answer:
Ilya [14]2 years ago
4 0

Answer:

Step-by-step explanation:

Discussion

9 with a sister

13 with a brother

7 with neither.

The total is 29 so you are  counting some siblings twice. There are 29 - 25 students that have both, so 4 students have both.

P(brother and sister) = 4/25

P(brother and sister) = 0.16

Answer

P = <u>0.16</u>

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Given :

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0             ^4C_0 (1/2)^{4}        = 1/16                     \frac{1}{16}

1               ^4C_1 (1/2)^{4}       = 1/4                       \frac{5}{16}

2                ^4C_2 (1/2)^{4}      = 3/8                      \frac{11}{16}

3                ^4C_3 (1/2)^{4}      = 1/4                       \frac{15}{16}

4                  ^4C_4 (1/2)^{4}    = 1/16                      1

4 0
3 years ago
72 is 25% of students that have a cat, how many total students are there?
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