The average length of time required to complete a college achievement test is approximately normal with...
The average length of time required to complete a college achievement test is approximately normal with a mean of 80 minutes and a standard deviation of 11 minutes. When should the test be terminated (in minutes) if you wish to allow sufficient time for 85% of the students to complete the test? (Round your answer to two decimal places.)
____ min
Homework Answers
z value at 85% = 1.04
z = (x - mean)/s
1.04 = (x - 80 )/11
x = 11 *1.04 + 80
x = 91.44
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