What is the probability that exactly 21 know of McDonalds or that 24 (80%) or more of them will?

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What is the probability that exactly 21 know of McDonalds or that 24 (80%) or more of them will?

Question Description

The Brand Name McDonalds has a possible 70% recognition rate. The owners want to verify that this is true by taking a small sample of 30 customers. What is the probability that exactly 21 know of McDonalds or that 24 (80%) or more of them will?