Question

The rhythm method of contraception is rated as 60% effective. Find the probability that it will be effective in each of five (5 out of 5) separate trials.

Answer 1

P(5R) = 0.60^5

P(5R) = 0.07776 = 0.078

Therefore the probability that it will be effective in each of five (5 out of 5) separate trials is 0.078

Explanation:

Given;

The probability that the rhythm method of contraception is effective once is P(R) = 0.60

The probability that it will be effective n times is;

P(nR) = 0.60^n

For this case n= 5

P(5R) = 0.60^5

P(5R) = 0.07776

P(5R) = 0.078