Math

The hieght,X ,of young American women is distributed normal with mean 65.5 and standard deviation 2.5 inches .find the probability of each the following events.
a- X<67
b-64<X<67

  1. 0
  2. 0
  3. 57
asked by Sniper
  1. 1. find
    Z-score = (X-mean)/stdev
    =(67-65.5)/(2.5)
    =(1.5)/2.5
    =0.6
    2. Look up standard normal distribution tables for one-tail where Z-score = 0.6
    P(x<X=67)=0.7257469 [from tables for Z=0.6]

    For part b, find similarly P(x<X=64)
    then
    P(64<x<67)
    =P(x<67)-P(x<64)

    1. 0
    2. 0
    posted by MathMate

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