Question

Suppose the number of cell phones in a household has a binomial distribution
with parameters n = 16, and p = 90 %.
Find the probability of a household having:
(a) 4 or 8 cell phones  
(b) 6 or fewer cell phones  
(c) 4 or more cell phones  
(d) fewer than 8 cell phones  
(e) more than 6 cell phones

Answer 1

Let X be the number of cell phones in a household

X ~ binomial(16,0.90)

a)

b)

Excel Command: =BINOM.DIST(6,16,0.9,TRUE)

c)

Excel command = 1-BINOM.DIST(4,16,0.9,TRUE)

d)

Excel Command : =BINOM.DIST(7,16,0.9,TRUE)

e)