Homework Help: DBU

Posted by KiKi on Sunday, October 28, 2012 at 8:32pm.

The mean time to complete a psychology exam is 34 minutes with a standard deviation of 8 minutes. Assume the distribution is normal. Find the probability of a student taking less than 28 minutes.

DBU - MathMate, Sunday, October 28, 2012 at 10:20pm
Z=(28-μ)/σ
Look up the standard normal distribution table and look at the percentage for the left tail.

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