Question

Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 68 percent of students work between ______ and ______ hours per week. Select the TWO numbers below that should fit in these blanks.


0
5
15
22
27
32
39
45

Answer 1

68% = mean ± 1 SD

However you should note that the distribution as described cannot be normally distributed. Two SD below the mean would be negative 12. How would you get -12 of work?

Answer 2

5 and 22