Suppose that the probabilities of a customer purchasing 0, 1, or 2 books at a book store are 0.2, 0.3, and 0.5, respectively. What is the expected number of books a customer will purchase?

Expectation number of books a customer will purchase  =  1.3

Step-by-step explanation:

x     : 0      1              2

p(x) :0.2,  0.3, and 0.5

Expectation

E(X) = ∑x P(x)

      = 0 X 0.2 +1 X 0.3+ 2 X 0.5

     = 1.3

Expectation  E(X) =  1.3

Expectation number of books a customer will purchase  =  1.3

the first question mark is 6 and the second question mark is 26 (the square root)

step-by-step explanation:

answer: all the values are within because it has a pattern that repeats from -6 to 4.

good luck!