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Title: Some marathons allow two runners to "split" the marathon by each running a half marathon. Alice ... Post by: Clement on Aug 31, 2019 Some marathons allow two runners to "split" the marathon by each running a half marathon. Alice and Sharon plan to split a marathon. Alice's half-marathon times average 92 minutes with a standard deviation of 4 minutes, and Sharon's half-marathon times average 96 minutes with a standard deviation of 2 minutes. Assume that the women's half-marathon times are independent. The expected time for Alice and Sharon to complete a full marathon is 92 + 96 = 188 minutes. What is the standard deviation of their total time?
▸ 2 minutes ▸ 20 minutes ▸ 4.5 minutes ▸ 6 minutes ▸ It cannot be determined. Title: Some marathons allow two runners to "split" the marathon by each running a half marathon. Alice ... Post by: krobdance on Aug 31, 2019 4.5 minutes
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