Wilma bought 4 boxes of crunch-a-lot cereal. one out of every 5 boxes has a coupon for a free box of crunch-a-lot. what is the probability that wilma got 2 coupons?

We have been given that Wilma bought 4 boxes of Crunch-a-lot cereal.

Further, we know that one out of every 5 boxes has a coupon for a free box of Crunch-a-Lot. We need to figure out the probability that Wilma got 2 coupons?

This question is based on Bernoulli's Trials. We know that probability for r successful draws out of n trials is given by:

We have . Upon substituting these values in this formula, we get:

This is the required probability.

both equations and proportions are better.