What is x when mean is 100 stand dev is 15 and area of shading is .99

x is near right of bell graph
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1 Answer

The area 0.99 has a z score of about 2.327, which means that the x value is 2.327 standard deviations from the mean. This is equivalent to 2.327*15=34.905 from the mean 100, making x=134.905 or about 135.

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