Question

assume that when adults with smart phones are randomly selected, 53% use them in meetings or classes. If 6 adult smartphone users are randomly selected find the probability that at least 4 of them use their smart phones in meetings or classes

Answer 1

p = 0.53

n = 6

X: Number of adults

X follows Binomial distribution.

PMF of Binomial distribution is

We have to find P(X 4)

P(X 4) = P(X = 4) + P(X = 5) + P(X = 6)

P(X 4) = P(X = 4) + P(X = 5) + P(X = 6) = 0.2615 + 0.1179 + 0.0222 = 0.4016