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Close to 45% of smartphone users say they upgrade their phone every 2 years. In a...

Close to 45% of smartphone users say they upgrade their phone every 2 years. In a random sample of 60 smartphone users, what is the probability that a. more than 35 smartphone users upgrade their phone every 2 years? b. at least 20 smartphone users upgrade their phone every 2 years? c. no more than 30 smartphone users upgrade their phone every 2 years? Answers are a) .0139 b) 0.9754 c).8183 need to understand why and see the formula

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