The Random Variable X Is the Number of Occurrences of an Event

question 21

Multiple Choice

The random variable x is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two time periods of an equal length. It is known that the mean number of occurrences in ten minutes is 5.3. The probability that there are 8 occurrences in ten minutes is

• A) .0241.
• B) .0771.
• C) .1126.
• D) .9107.

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Definitions:

Catharsis

A process of releasing and thereby providing relief from strong or repressed emotions.

Hypnosis

A state akin to trance characterized by focused concentration, diminished awareness of surroundings, and increased openness to suggestion.

Psychiatry

A branch of medicine focused on the diagnosis, treatment, and prevention of mental, emotional, and behavioral disorders.

Psychology

The scientific study of the human mind and its functions, especially those affecting behavior.