The following frequency distribution reports the number of frequent flier miles, reported in thousands, for employees of Brumley Statistical Consulting Inc. during the most recent quarter. Frequent Flier Miles (000) 0 up to 5 5 up to 10 10 up to 15 15 up to 20 20 up to 25 Number of Employees 12 23 7 Total 50 Required: a. How many employees were studied? Number of employees b. What is the midpoint of the first class? (Enter the answer in thousands. Round your answer to 1 decimal place.) Midpoint thousand frequent flier miles d. A frequency polygon is to be drawn. What are the coordinates of the plot for the second class? (Round your answers to 1 decimal place.)
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.
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