Determining the probability using mean and standard deviation.
A sample of 100 is taken from a population which has a normal distribution with a mean of 80 and a standard deviation of 40.
What is the probability that the sample mean is between 74 and 81 is?© SolutionLibrary Inc. solutionlibary.com 9836dcf9d7 https://solutionlibrary.com/statistics/descriptive-statistics/determining-the-probability-using-mean-and-standard-deviation-1pe
...81) = ?
<br>Xbar - Normal (mean=80, sd=40/sqrt100 = 40/10 = 4)
<br>P (74< Xbar < 81) ...