A data set with a mean of 90 has a standard deviation of 2.5. Which of the following is the smallest number that falls within one standard deviation of the mean?	Choose the correct choice from the following choices:
A) 53 B) 56 C) 59 D) 63.5 E) 87
One standard deviation of the mean is from{mean}-{deviation}=90-2.5= 
<gadget id="calculator">90-2.5</gadget>
<output>87.5</output>
87.5 to{mean}+{deviation}=90+2.5=92.5. The smallest number within this range from the options is 87.   Answer: E.   Hope this helps.
<result>E</result>
A data set with a mean of 90 has a standard deviation of 2.5. Which of the following is the smallest number that falls within one standard deviation of the mean?