Question 269941
The U.S. National Center for Health Statistics collects data on cigarette smokers by sex and age and publishes the results in Vital and Health Statistics. 
Suppose that a sample of 2760 females who presently smoke has a mean of 40.6 years and a standard deviation of 10.2 years. 

Calculate the age value that is 1.90 standard deviations below the mean.
That point has a z-value of -1.90
Find the corresponding x-value:
x = z*s + u
x = -1.90*10.2+40.6
x = 21.22
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The age value that is 1.90 standard deviations below the mean is?
Ans: 21.22
Round up 22 yrs of age
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Cheers,
Stan H.