A Laboratory Technician Records the Life Span (In Months) of Rats

A laboratory technician records the life span (in months) of rats treated at birth with a fertility hormone. From the following frequency distribution, find the sample standard deviation of life span.
  $$\begin{array} { | l | l | l | l | } \hline \text { Life span (months) } & \text { Midpoint } x & \text { Frequency } f & \text { Product } x f \\\hline -0.5 - 2.5 & & 8 & \\\hline 2.5 - 5.5 & & 19 & \\\hline 5.5 - 8.5 & & 25 & \\\hline 8.5 - 11.5 & & 29 & \\\hline 11.5 - 14.5 & & 19 & \\\hline\end{array}$$ Round your answer to the nearest integer.

A) 5 months
B) 7 months
C) 4 months
D) 8 months
E) 6 months

Correct Answer:

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