The Central Limit Theorem for Sample Means · Exercise 4
Suppose that a category of world-class runners are known to run a marathon (26 miles) in an average of 145 minutes with a standard deviation of 14 minutes. Consider 49 of the races. Let the average of the 49 races.
(a) ~ _____(_____,_____)
(b) Find the probability that the runner will average between 142 and 146 minutes in these 49 marathons.
(c) Find the 80^th percentile for the average of these 49 marathons.
(d) Find the median of the average running times.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Introductory Business Statistics 2e · §7.1 The Central Limit Theorem for Sample Means · Exercise 4
No hints for this one.
Check your full solution
Upload photos of your handwritten work or a PDF, and Lemma will read it and tell you whether it's right — and where it first goes wrong if not.