SOLUTION: The lengths of boards are normally distributed with a mean of 3.9m and a standard deviation of 1.8m. Seventy-five percent of the boards are less than what amount? HELP, HELP -

Question 955029: The lengths of boards are normally distributed with a mean of 3.9m and a standard deviation of 1.8m. Seventy-five percent of the boards are less than what amount?
HELP, HELP - I'M DROWNING!!!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Find the z score when .
The corresponding z score is .

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