What is the expected number of female children in a family with three children? 1 1.5 2 2.5

Option B is the correct answer.

Step-by-step explanation:

Expected value of female children= Probability of female children x Total number of children.

A child can be male or female, so there are 2 combinations, favorable outcome is female.

Probability of female children

Expected value of female children

Option B is the correct answer.

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0