11.4k views
2 votes
The finishing times, in minutes, for running marathons have an unknown distribution with mean 297 and standard deviation 32 minutes. A sample, with size n=41, was randomly drawn from the population. Using the Central Limit Theorem for Means, what is the mean for the sample mean distribution?

User Nimit
by
7.5k points

1 Answer

7 votes

Answer:

The mean for the sample mean distribution is 297 minutes.

Explanation:

The Central Limit Theorem estabilishes that, for a random variable X, with mean
\mu and standard deviation
\sigma, a large sample size can be approximated to a normal distribution with mean
\mu and standard deviation
(\sigma)/(√(n)).

Using the Central Limit Theorem for Means, what is the mean for the sample mean distribution?

The mean is the same as the population mean, that is, 297 minutes.

User Stefano Cordio
by
8.9k points