Hi,

mean of 400 and a standard deviation of 20

Determine the value of x such that 60% of the values are greater than x.

 NORMSINV(0.112)= -1.216 = .2533,  

 z = .2533 = (X-400)/20

     20*.2533 + 400 = X = 405.066 = 406 rounded Up

 

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