A Statistic Professor fiNds She Averages fiVe E-Mail Messages Per

question 13

Multiple Choice

A statistic professor finds she averages five e-mail messages per day from students. Assume the
Number of messages approximates a Poisson distribution.
What is the probability that on a randomly selected day she will have five messages?

• A) 0.0067
• B) 0.875
• C) 0.175
• D) 1.0

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Definitions:

Wechsler Adult Intelligence Scale

A standard psychological test for measuring adult intelligence in various cognitive domains.

Population Standard Deviation

A measure of the dispersion or variability within a full population data set.

Raw Scores

The original, unmodified scores obtained in any assessment without adjustments or transformations.

Normally Distributed

Describes a probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean.