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μ = 16477.64 seconds
σ = 2247.55 seconds
n = 35 runner
1. What is the probability a randomly selected group of n runners will have a mean completion time of less than 4.5 hours?
2. What is the probability a randomly selected group of n runners will have a mean completion time of over 5 hours?
3. What is the 90th percentile for the mean value of n runners, for the variable you selected?
4. For the calculations you have completed above, explain why it was necessary for us to hold the sample size n constant?
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When restricted to the 239 active traders in the sample, Pew reports that 45% rely on the Internet for investment information.
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