Assume that when adults with smartphones are randomly selected, 46% use them in meetings or classes. if 9 adult smartphone users are randomly selected, find the probability that at least 6 of them use their smartphones in meetings or classes.

0.18173219.

Step-by-step explanation:

We have been asked to find what will be the probability that at least 6 of 9 adults use their smartphones in meetings or classes.

We will find our answer using Bernoulli's trails.

First of all we will find the probabilities when r is 6, 7,8 and 9 then we will add them all.

When r=6,

Similarly we will find Probabilities when r=7, 8 and 9.

When r=7

When r=8

When r=9,

Now let us add all the probabilities to get the final answer.

Therefore, probability that at least 6 of 9 adults use their smartphones in meetings or classes is 0.18173219.

step-by-step explanation: