A company asserts that 80% of the customers who purchase its special lawn mower will require no

Question:

A company asserts that 80% of the customers who purchase its special lawn mower will require no repairs during the first 2 years of ownership.

Your personal study has shown that only 70 of the 100 in your sample lasted the 2 years without incurring repair expenses. What is the probability of your sample outcome or less if the actual repair expense–free percentage is 80%?

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