For the Following Frequency Distribution (Assume the Data Represent a Population)

For the following frequency distribution (assume the data represent a population), $$\begin{array} { l r } \text { Class } & \text { Frequency } \\70 - 79 & 5 \\80 - 89 & 9 \\90 - 99 & 11 \\100 - 109 & 9 \\110 - 119 & 6\end{array}$$ ​
a.
Compute the mean.
b.
Compute the standard deviation.

Correct Answer:

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​
a.
95
b....

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