(Answered) Normal calculationa canadian survey asked grad school

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Normal calculation

A Canadian survey asked grad school students about the weekly time they spend studying outside the classroom. The time spent studying in minutes follows a normal distribution with mean 720 minutes and standard deviation 120 minutes.

a) What can you say about the study time range of the middle 95% students?

b) Find the percentage of students who might study less than 500 minutes.

c) What study time would be such that 20% of students study more than it?

Answer the questions by-hand first, and then using Excel. Sketch the density curves that support your answers

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