SOLUTION: Question text Records at a certain university show that the cost of books purchased by students per semester is approximately normally distributed with a mean of $123.50. If 12%

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Question 871711: Question text
Records at a certain university show that the cost of books purchased by students per semester is approximately normally distributed with a mean of $123.50. If 12% of students pay more than $165 per semester, determine which statement regarding the standard deviation of the distribution is true.
Select one:
a. There standard deviation of the distribution cannot be computed with the given information.
b. The standard deviation of the distribution is approximately $47.10
c. The standard deviation of the distribution is approximately $35.47.
d. The standard deviation of the distribution is approximately $18.60.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
mean of $123.50.
invNorm(.88) = 1.175
1.175 = 41.50/sd = (165-123.50)/sd
sd = 41.50/1.175 = 35.32
c.