[See Steps] The average time students need to finish a particular test is 70 minutes with a standard deviation of 12 minutes. Assume that these times are
Question: The average time students need to finish a particular test is 70 minutes with a standard deviation of 12 minutes. Assume that these times are normally distributed. If we want 90% of the students to have sufficient time to finish the test, how much time should we give them.
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Rule of Thumb for the Standard Deviation - MathCracker.com