A Mail Order Company Tracks the Number of Returns It

question 21

Essay

A mail order company tracks the number of returns it receives each day.Information for the last 50 days shows $$\begin{array} { c c } \text { Number of returns } & \text { Number of days } \\\hline 0 - 99 & 6 \\100 - 199 & 20 \\200 - 299 & 15 \\300 \text { or more } & 9\end{array}$$
a.How many sample points are there?
b.List and assign probabilities to sample points.
c.What procedure was used to assign these probabilities?

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Definitions:

Standard Normal Probability Distribution

A normal distribution with a mean of 0 and a standard deviation of 1, used in statistical analysis to represent standardized values of a dataset.

Probability Density Function

A function that describes the likelihood of a random variable to take on a particular value.

Continuous Random Variable

A variable whose value is not fixed and can assume an infinite number of values within a given range.

Normal Probability Distribution

A bell-shaped distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.