(a) Find the probability that the sample proportion obtained from the sample of 270 Bank of America customers would be within three percentage points of the population proportion.

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Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.