A population has a normal distribution with a mean of 79.6 and a standard deviation of 13.3.Assuming 
,the probability,rounded to four decimal places,that the sample mean of a sample of size 18 elements selected from this populations will be less than 80.1 is:
Definitions:
Coefficient of Variation
A statistical measure of the dispersion of data points in a data series around the mean, expressed as a percentage.
Index Fund
An investment fund designed to follow certain preset rules so that the fund can track a specified basket of underlying investments.
PHStat
An Excel add-in designed to perform statistical analysis, it provides tools for statistical tests, data analysis, and graphical presentations.
Coefficient of Variation
A standardized measure of dispersion of a probability distribution or frequency distribution, calculated as the ratio of the standard deviation to the mean.
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