Answer:
The probability that the teacher calls upon a boy is, 0.5714.
Step-by-step explanation:
The data provided is:
Boys Girls Total
Wilmette 11 7 18
Winnetka 5 4 9
Glencoe 4 4 8
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Total 20 15 35
The total number of students is, N = 35.
The number of boys in the class is, n (B) = 20
The probability of an event E is:
[tex]P(E)=\frac{n(E)}{N}[/tex]
Compute the probability of selecting a boy as follows:
[tex]P(B)=\frac{n(B)}{N}=\frac{20}{35}=\frac{4}{7}=0.5714[/tex]
Thus, the probability that the teacher calls upon a boy is, 0.5714.
