Question

Assume that when adults with smartphones are randomly selected, 58% are use them in meetings ir classes. if 5 adults smartphone users are randomly selected, find the probability that exacly 3 of them use their smartphones in meetings or classes. the probability is

Answer 1

When adults with smartphones are randomly selected, 58% of them use the smartphones in meetings or classes.

5 adults with smartphones are randomly selected.

We have to find the probability that exactly 3 adults use the smartphones in meetings or classes.

Let, X be the random variable denoting the number of adults out of these 5, who use smartphones in meetings or classes.

Then X follows binomial with parameters n=5 and p=0.58.

so, the PMF of X is

Where, i can take integer values from 0 to 5.

So, we have to find

So, the required probability is 0.3442.