Suppose that the probabilities of a customer purchasing 0, 1, or 2 books at a book store are 0.20.2, 0.20.2, and 0.60.6, respectively. what is the expected number of books a customer will purchase?

Form the sum of products of probability and number of books:

0.2×0 +0.2×1 +0.6×2 = 0 +.2 +1.2 = 1.4 books

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.