Didn't I answer this previously? Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you.
Range = highest score minus lowest
Find the mean = sum of scores/number of scores
Subtract each of the scores from the mean and square each difference. Find the sum of these squares. Divide that by the number of scores to get variance.
Standard deviation = square root of variance
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability in the smaller area related to the Z score.
I'll let you do the calculations.
Listed below are the duration's (in hours) of a simple random sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time unusual? Why or why not?
71, 100, 237, 199, 164, 269, 193, 379, 252, 233, 388, 331, 223, 240, 0
I think I know how to do this but there are so many steps that I'm not sure what becomes before what. Please Help, this is my last class and then I graduate.
2 answers
Yes, and maybe I should have made myself clearer but my husband just killed himself and this is my last class and then I graduate and I never took Algebra or anything beyond basic math in high school. What or all I needed to know was the steps not the answers. Thank you
1 answer