Florida International University

Business Statistics - STA 2023

Ms. Laura Reisert Instructor

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Chapter 4-B Supplementary Exercises

1. If X is a binomial random variable with n = 20 and p = .40, find:

a. The expected value and variance of X

b. P(X < 14)

c. P(X < 10)

d. P(X > 6)

e. P(X > 12)

f. P(9 < X < 14)

g. P(5 < X < 11)

h. P(7 ≤ x < 15)

i. P(X=9)

2. If X is a binomial R.V. with n = 12 & P = .8, find

a. P(X > 10

b. P(X = 8)

c. P(X < 1)

d. P(6 < X < 9)

Key

1.

a) 8, 4.8	d) .750	g) .892
b) .998	e) .057	h) .748
c) .755	f) .239	i).159

2.

a) .5584

b) .1329

c) 4 x 10 9

d) .1861