An unknown distribution has a mean of 50 and a standard deviation of 15. Samples of size n = 45 are drawn randomly from the population. Find the probability that the sample mean is between 35 and 45. (round to 4 decimal places)
Added by Fernando B.
Step 1
The standard error of the mean is the standard deviation divided by the square root of the sample size. In this case, it is 15/sqrt(45) = 2.2361. Show more…
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