Keke's Kookies (https://kekekookies.com/) sells mini cookies in packs of 5 and has determined a probability distribution for the number of cookies that they sell in a given day.

X= #sold
	0	5	10	15	20
Probability	0.15	0.1	0.11	...?	0.1

a. What is the probability of selling 15 mini cookies in a given day?

b. Find the expected number of mini cookies sold in a day using the discrete probability distribution.

c. Find the variance of the number of mini cookies sold in a day using the discrete probability distribution.