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the length of time it takes to complete a college placement test is normally distributed with a mean of 36 minutes and a standard deviation of 7 minutes. how much time (to the nearest minute) is needed so that 90% of the test takers have time to finish.

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Answer:

45 min

Step-by-step explanation:

look on z-score table for the value .900

closest on my table is z-score + 1.28

   this is 1.28 S.D. above the mean

          36 + 1.28 * 7 = ~ 45 min

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