The following table describes the numbers of adults in groups of five who reported sleepwalking (based on data from " Prevalence and Comorbidity of Nocturnal Wandering In the U.S. Adult General Population" by Ohayon et al., Neurology, Vol.78, No. 20)

x	P(x)
0	0.172
1	0.363
2	0.306
3	0.129
4	0.027
5	0.002

a) Find ,2,and using any method. If using calculator, list the prompts you used on the TI 84+.

b) Find the probability of getting at least 2 sleepwalkers among a group of 5 adults

c) Find the probability of getting at most 3 sleepwalkers among a group of 5 adults