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1 Answer
- AlanLv 71 year agoFavorite Answer
P(z< Z) =0.75
Reverse look this up
P(z< 0.67) =0.74857
P(z<0.68) = 0.75175
so if you take the closest value
z =0.67
z = 0.67 + ( 0.75-0.74857)*(0.01)/(0.75175-0.74857)
z = 0.6745
Z = (x-mean)/standard deviation
0.6745 = ( x - 1650)/ 320
320*0.6745 = x- 1650
x = 1650 + 320*0.6745 = 1865.84
or
(using the closest value)
x = 1650 + 320*0.67= 1864.4
nearest integer using interpolation = 1865
nearest integer using closest value = 1864