Use the at least once rule to find the indicated probability.
-The probability of winning $20 in a particular lottery is 0.04. What is the probability that you will get at least one $20 winner if you buy 90 tickets?

Question

Quizplus · Accepted Answer

The probability of not winning $20 on a single ticket is 1 - 0.04 = 0.96. The probability of not winning on any of the 90 tickets is 0.96^90. Therefore, the probability of winning at least once is 1 - 0.96^90, which is approximately 0.975.

Use the at Least Once Rule to Find the Indicated