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. 
Life span (months)Midpoint xFrequency fProduct xf-0.5 - 2.5 8 2.5 - 5.5 19 5.5 - 8.5 25 8.5 - 11.5 29 11.5 - 14.5 19 Round your answer to the nearest integer. 

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


Answer: C

Mathematics

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