Inactive Tutor answered 07/12/23
Tutor
New to Wyzant
z74.4 = (74.4 - 77) / 2.6
z74.4 = -1
z79.6 = (79.6 - 77) / 2.6
z79.6 = 1
68.26%
Sanjana M.
asked 07/12/23A calculus exam that was taken by 99 students is recorded and normally distributed. The mean score on the exam is 77 and the standard deviation is 2.6. What percent of the scores are in the 74.4 and 79.6 range?
Inactive Tutor answered 07/12/23
z74.4 = (74.4 - 77) / 2.6
z74.4 = -1
z79.6 = (79.6 - 77) / 2.6
z79.6 = 1
68.26%
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