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How to understand this Standard Deviation question?
Asked by jessiecakes (24)
April 19th, 2011
Here’s the question:
The lengths of a sample of tiger canines were measured. 68 % of the lengths fell within a range between 15 mm and 45 mm. The mean was 30 mm. What is the standard deviation of this sample?
A. 5 mm
B. 15 mm
C. 7.5 mm
D. 30 mm
I just don’t really understand how to calculate the SD if I don’t have the number of values in the sample. Thanks!
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