A data set with a mean of 60 has a standard deviation of 4.5. Which of the following is the smallest number that falls within one standard deviation of the mean? Choose the correct answer:
A) 55
B) 56
C) 59
D) 63.5
E) 65
One standard deviation of the mean is from{mean}-{deviation}=60-4.5= 
<gadget id="calculator">60-4.5</gadget>
<output>55.5</output>
55.5 to{mean}+{deviation}=60+4.5=64.5. The smallest number within this range from the options is 55.   Answer: A.   Hope this helps.
<result>A</result>
A data set with a mean of 60 has a standard deviation of 4.5. Which of the following is the smallest number that falls within one standard deviation of the mean?