Get the answers you've been searching for with IDNLearn.com. Get accurate and detailed answers to your questions from our dedicated community members who are always ready to help.

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