Normal distribution mean
The mean of the normal Distribution is usually equals to Median and Mode.
Notably, it is symmetry about the center.
The 50% of the entries are less than the mean and 50% are greater than the mean.
Normal standard deviation
The Standard Deviation measures how spread out the numbers are.
A food distribution company receives rating has 10 ratings ranging from 1-5
The mean of the ratings would be a point between ratings 1.5 and 3.5
The mean will be 2.5
b) Calculating the Standard deviation will be;
Taking a 95% confidence interval on the ratings.
As illustrated in the excel presentation above, there are three parts on each side of the curve which depicts the 3 standard deviations.
Thus the rating has a standard deviation of 0.6667
Was this Helpful?