Post by mm719 on Apr 11, 2004 18:19:21 GMT -5
I'm having some trouble with a few statistics problems. ANY help would be appreciated.
1. Mean number of hours work per week by those who worked full time is 43.9. one third of those who worked full time work less then 40 hours per week.
a) what is the standard deviation?
b) 20 percent of those working full time work more than 49 hours per week. What is the standard deviation?
2. 40 percent of sales are more than 470,000 and 10 percent are more than 500,000. what are the mean and the standard deviation?
3. Jon scored a 30 on the test. Only 2 percent scored higher then him. The mean score for all students who took the test is 18.3. Kim scored 25 and Jim scored 18. What were Kim and Jim's percentile ranks?
1. Mean number of hours work per week by those who worked full time is 43.9. one third of those who worked full time work less then 40 hours per week.
a) what is the standard deviation?
b) 20 percent of those working full time work more than 49 hours per week. What is the standard deviation?
2. 40 percent of sales are more than 470,000 and 10 percent are more than 500,000. what are the mean and the standard deviation?
3. Jon scored a 30 on the test. Only 2 percent scored higher then him. The mean score for all students who took the test is 18.3. Kim scored 25 and Jim scored 18. What were Kim and Jim's percentile ranks?