Question

When an adult is randomly selected, there is an 85% chance that this person knows what Twitter is. Find the probability that exactly three out of any five randomly selected adults know of Twitter.

Answer 1

This can be solved by using the binomial distribution, as follows:

`P(3\ out\ of\ 5)=5C3*(0.85)^(3)*(0.15)^(2)=0.1382`
The answer is: 0.1382 to 4 decimal places.