stats week 7 problem 4

Project Description:

assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2150 per hour and a standard deviation of $210. what is the operating cost for the lowest 6% of airplanes?
i know that i take the 2150 - ? (210)
i am having problems figuring out what number i need to multiply the 210 by before subtracting the total from the 2150.
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