I am currently teaching two statistics classes, one at 8:00 a.m. and the other at 10:00 a.m. The following table summarizes my attendance records by showing the probability of the number of absent students per class:

Probability Number of Absent Students 8 a.m. Class 10 a.m. Class 0 0.06 0.16 1 0.19 0.32 2 0.25 0.25 3 0.20 0.16 4 0.21 0.06 5 0.09 0.05

a. Calculate the mean number of students absent for each class.

b. Calculate the standard deviation for the number of students absent for each class.

c. Are these results to be expected?

AppendixLO1