Homework Help: Statistics

Posted by Sam on Sunday, November 1, 2009 at 9:30pm.

Among employed women, 25% have never been married. Select 10 employed women at random. What is the mean number of women in such a sample who have never been married? What is the standard deviation?

I think the mean would be 2.5, but I'm not sure about the standard deviation.

Statistics - Pragyan, Monday, November 2, 2009 at 4:52am
probability that the women was unmarried = p = 0.25
probability that she was married = q = 1-p = 0.75
sample size , n = 10
mean = np = 10 x 0.25 = 2.5
standard deviation = sq. root (npq)
=1.37

Answer this Question

Related Questions

statistics - the participants in a television quiz show are picked from a large ...
word problem - A study reported that in a random sampling of 100 women over the ...
statistics - we developed a 95% z confidence interval for the mean BMI of women ...
statistics - Find the indicated binomial probabilities. Round to the nearest 3 ...
statistics - Find the indicated binomial probabilities. Round to the nearest 3 ...
Statistics - A recent study was designed to compare smoking habits of young ...
elementary stats - the participants in a television quiz show are picked from a ...
statistics - if there 60% math major are women, 15 were random. what probility ...
statistics - 60% of math major are women 15 were random and what probability ...
statistics - Women’s heights are normally distributed with a mean of 63.6 ...

For Further Reading

First Name:
School Subject:
Answer: