What is the approximate standard deviation

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A person estimates that his commute to work will most likely take 50 minutes. However, it could talk as long as 1 hour and 35 minutes worst case, or as little as 35 minutes best case. What is the approximate standard deviation based on the above estimates?
a.70 minutes
b.60 minutes
c.15 minutes
d.10 minutes

Reference no: EM13707109

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