Question: I need help solving this probability question. Please see attached JPG for details. Thanks! The range for a set of data is estimated to be

I need help solving this probability question. Please see attached JPG for details. Thanks!

The range for a set of data is estimated to be 72. a. What is the planning value for the population standard deviation? b. At 95% confidence, how large a sample would provide a margin of error of 3? c. At 95% confidence, how large a sample would provide a margin of error of 2

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