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Dmitriy789 [7]
3 years ago
11

In a certain class of​ students, there are 11 boys from​ Wilmette, 7 girls from​ Wilmette, 5 boys from​ Winnetka, 4 girls from​

Winnetka, 4 boys from​ Glencoe, and 4 girls from Glencoe. If the teacher calls upon a student to answer a​ question, what is the probability that the student will be a​ boy
Mathematics
2 answers:
Gnoma [55]3 years ago
7 0

Answer:

9/24

Step-by-step explanation:

katrin2010 [14]3 years ago
3 0

Answer:

Probability that a boy will answer the question = \frac{4}{7}

Step-by-step explanation:

In a certain class of students,

Number of boys from Wilmette = 11

Number of boys from Winnetka = 5

Number of boys from Glencoe = 4

Total boys in the class = 11 + 5 + 4 = 20

Similarly, total number of girls in the class = 7 + 4 + 4 = 15

Total number of students in the class = 20 + 15 = 35

Now number of ways we can choose 1 boy out 20 boys

= ^{20}C_{1}=20

Similarly number of ways, we can choose a boy out of 35 students = ^{35}C_{1}=35

Now the probability that a boy will answer the question = \frac{20}{35}

= \frac{4}{7}

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