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Biology, 24.08.2019 06:30 haitch

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

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