Tuesday

January 27, 2015

January 27, 2015

Posted by **Kim** on Tuesday, August 20, 2013 at 4:35pm.

Assuming that births of boys and girls are equally likely, find the mean and standard

deviation for the random variable x.

- statistic -
**MathMate**, Wednesday, August 21, 2013 at 8:17amThis is a binomial distribution with parameters

n=3 (number of trials in the experiment)

p=1/2 (probability of boys, X)

q=1-p (probability of girls)

For a random variable X with a binomial distribution (n,p,q), then

E(x)=μ=np

σ²=npq

where σ=standard deviation (of population)

**Answer this Question**

**Related Questions**

Statistics - In planning a family of 4 children assume boys and girls are ...

statistics - assuming that boys and girls are equally likely, estimate the ...

Math - in a family with two children, what are the probabilities of the ...

math - in a family with two children, what are the probabilities of two boys, ...

statistics - For every 100 births in the U.S., the number of boys follows, ...

Math - In a family with two children, what are the probabilities of the ...

Math - In a family with two children, what are the probabilities of the ...

math - Suppose that China’s population policy is modified so that every family ...

English Expression - A: How many boys and girls are there in the park? B: There ...

statistics - If boys and girls are equally likely and groups 400 births are ...