136 - 2a What is the value of a
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Let 
be the data set. The variance of the data is
where
is the mean of the data. You have
so if each data point was multiplied by 2.4, you have a "new" mean of
So in the variance formula, you have
so the standard deviation of the new data set would be
The original standard deviation was
so the new one would be 
.
where
so if each data point was multiplied by 2.4, you have a "new" mean of
So in the variance formula, you have
so the standard deviation of the new data set would be
The original standard deviation was