Company ABC's customer retentions per site are normally distributed with a standard deviation of 21 retaining customers. If Company ABC has 254 retaining customers, and the z-score of this value is 3, then what is the mean customers retained? Do not include the units in your answer. For example, if you found that the mean is 150 customers, you would enter 150.
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
Company ABC's customer retentions per site are
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