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.

p ÷ r = tan(x)

step-by-step explanation:

given that there is a figure below shows a right triangle: a right triangle is shown with hypotenuse equal to q units and the length of the legs equal to p units and r units.

graph is missing so i will create the graph as per given information.

the angle between the legs having lengths p units and q units is y degrees. the angle between the legs having lengths r units and q units is x degrees.

now we need to find about what is p ÷ r equal to.

so we can use trigonometric ratio tan(x)=[altitude]/[base] to find the value of p ÷ r, because p is the altitude and r is the base.

p ÷ r=tan(x)

hence final answer is p ÷ r=tan(x).