A kindergarten class consists of 14 boys and 11 girls. If the teacher selects ch

Question

A kindergarten class consists of 14 boys and 11 girls. If the teacher selects children from the class using random sampling, a)What is the probability that the first child selected will be a girl? b)If the teacher selects a random sample of n = 3 children and the first two children are both boys, what is the probability that the third child selected will be a girl?
A kindergarten class consists of 14 boys and 11 girls. If the teacher selects children from the class using random sampling, a)What is the probability that the first child selected will be a girl? b)If the teacher selects a random sample of n = 3 children and the first two children are both boys, what is the probability that the third child selected will be a girl?

Explanation / Answer

A kindergarten class consists of 14 boys and 11 girls. If the teacher selects children from the class using random sampling,

we have 14 boys and 11 girls.

a) probability of selected is girl = 11 / (14+11) = 11/ 25

b) the first two children are both boys, what is the probability that the third child selected will be a girl?

first two already boys then

we have 12boys and 11 girls

probability = 11 / ( 11+12) = 11/23

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