The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. How much time should be given to complete the exam so that 90% of the students complete the exam in the allotted time?

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The time to complete a standardized exam is approximately normal with a mean of 70 minutes and a standard deviation of 10 minutes. How much time should be given to complete the exam so that 90% of the students complete the exam in the allotted time?

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I understand that its a Probability Distribution problem, but I dont know which formula(s) to use to figure this out
M the proper number of minutes to meat the criterion. \((M-70)/10 = Z_{90}\) Find the Z-value with 10% of the Normal Distribution in the right tail. Solve for M.
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