The arithmetic mean and standard deviation of a certain normal distribution are 16.5 and 1.5, respectively. What value is exactly 2 standard deviations less than the mean?	Options
A) 10.5	B) 11	C) 11.5	D) 12	E) 13.5
The value which isexactlytwo SD less than the mean is:mean-2*SD=16.5-2*1.5=13.5.   Answer: 13.5.
<result>E</result>
The arithmetic mean and standard deviation of a certain normal distribution are 16.5 and 1.5, respectively. What value is exactly 2 standard deviations less than the mean?