It has been reported that 60% percent of all internet users have been attacked by viruses. If 14 people are randomly surveyed,find the following probabilities .

The easiest way to do this problem is to use a binomial distribution table.

For a), n = 14, p = .6, x = 0, 1, 2 ,3,4,5 Add together the probabilities you find in the table, then subtract from 1 for your answer.

For b), n = 14, p = .6, x = 0, 1, 2, 3 Add together the probabilities you find in the table. This will be your answer.

For c), n = 14, p = .6, x = 12, 13, 14 Add together the probabilities you find in the table, then subtract from 1 for your answer. After calculation , we get these values

A. Probability of Atleast 6 have been Attacked = 1- 0.058 = 0.942

B. Probability no more than 3 have been attacked = 0.0039

C. Probability of less than 12 hba = 1 - 0.0397 = 0.9603