Question 962517
Mean = 523/8 = 65.375


You get the mean by adding up all the numbers and then dividing by 8 (since there are 8 numbers).


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Standard Deviation =  7.0698


This is approximate. Doing the calculation by hand is tedious so use a calculator here.


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Lower Bound: 
L = (mean) - (standard deviation) = 65.375 - 7.0698 = 58.3052


Upper Bound: 
U = (mean) + (standard deviation) = 65.375 + 7.0698 = 72.4448


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So the data that is roughly within 1 standard deviation of the mean will range from 58.3052 to 72.4448


Those data values that are between 58.3052 and 72.4448 from the data set are: 69, 63, 69, 68, 65, 61


There are <font color="red">6</font> data values. So that is the final answer.


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