Part 1
(a) Find the mean, variance, and standard deviation of the probability distribution.


The mean is …?

(Round to one decimal place as needed.)


Part 2
The variance is …?

(Round to one decimal place as needed.)


Part 3
The standard deviation is … ?

(Round to one decimal place as needed.)


Part 4
(b) Interpret the results.


The mean is ….? so the average student is involved in

(at least 5 activities/ 3 or 4 activities/ no activities)


The standard deviation is ….? , so the typical number of activities per student


(deviates from the mean by about 4 activities/ does not deviate from the mean/

deviates from the mean by more than 4 activities/ deviates from the mean by about 2 activities)

(Round to one decimal place as needed.)