SOLUTION: The scores of 9 job applicants in a 15-item Math exam are as follows: 6, 12, 15, 9, 10, 9, 8, 7, 6. Calculate the mean, range, variance and standard deviation.

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Question 1171132: The scores of 9 job applicants in a 15-item Math exam are as follows: 6, 12, 15, 9, 10, 9, 8, 7, 6. Calculate the mean, range, variance and standard deviation.
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
add them up (82), divide by the number (9) and get 9.111 as mean
range is high-low or 15-6=9
variance is 7.65
sd is 2.77 Note, I treated this as a population. If treated as a sample the sd is 2.93 and the variance 8.58