SOLUTION: In Melanie's Styling Salon, the time to complete a simple haircut is normally distributed with a mean of 25 minutes and a standard deviation of 4 minutes. For a simple haircut, the

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Question 1197337: In Melanie's Styling Salon, the time to complete a simple haircut is normally distributed with a mean of 25 minutes and a standard deviation of 4 minutes. For a simple haircut, the middle 90 percent of the customers will require...
a)between 18.4 and 31.6
b)between 19.9 and 30.1
c)between 20.0 and 30.0
d)between 17.2 and 32.8
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
In Melanie's Styling Salon, the time to complete a simple haircut:
  µ = 25 and σ = 4
 the middle 90 percent of the customers will require...
invNorm(area to left of desired z).
Invnorm(.05) = 18.4   (.90 in between)
Invnorm(.95) = 31.6
a) is Your answer
Wish You the Best in your Studies.