Question 922041
The height of 250 soldiers in a military camp confirms a normal distribution with mean height of 155 cms and S.D. of 20 cms. Find the proportion of soldiers with height above 170 cms. -------------------
z(170) = (170-155)/20 = 15/20 = 3/4 
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P(x > 170) = P(z > 0.75) = normalcdf(0.75,100) = 0.2266 = 22.66%
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Also find the height of the shortest soldier in the group of tallest 20% soldiers.
Find the z-value with a right tail of 20%.
invNorm(0.8) = 0.8416
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Find the correspond soldier height:
x = 0.8416*20 + 155 = 171.83 cm
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Cheers,
Stan H.
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