Finite math
posted by MV .
A newly married couple decides to keep having children until they have a girl. What is the probability that the couple will have at least 5 children?

This is Geometric distribution.
Let Y be r.v."No: of chldn before a girl"
P(Y=y)=pq^(y1)...therefore
P(Y=5)=(0.5)(0.5)^(51)=0.03125.
Respond to this Question
Similar Questions

maths
Hi Can anyone help please: Suppose that the births of boys and girls can be modelled by rollling a fair die with 27 faces, 14 of which represent a boy and 13 represent a girl. 1. Using this model, choose the option that is closest … 
maths
Hi Can anyone help please: Suppose that the births of boys and girls can be modelled by rollling a fair die with 27 faces, 14 of which represent a boy and 13 represent a girl. 1. Using this model, choose the option that is closest … 
math
A couple intends to have four children. Assume that having a boy and girl is equally likely event. a) List sample space b) Find the probability that couple has two boys and two girls; c) Find the probability that couple has at least … 
probability
a couple is planning to have three children. Find the probability that the couple will have: a.) 2 girls and 1 boy? 
Data Management
a couple is planning to have seven children. what is the probability that at least 3 of the children will have a birthday in the same month 
Math
A newly married couple expected a boy and a girl or four children, occuring boy or girl has equal probability. Find the probability of success of their expectations. 
Math
#1: A couple plans on having 3 children, how do I create a tree diagram with 8 possible outcomes? 
math
A couple plans to have three children. What is the probability that a) they have all boys? 
Probability
A couple plans to have three children. What is the probability that a) they have all boys? 
math
A couple plans to have three children. What is the probability that a) they have all boys?