Replacement Times for TV Sets Are Normally Distributed with a Mean

question 105

Short Answer

Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years, (based on data from "Getting Things Fixed," Consumer Reports).

-One classic use of the normal distribution is inspired by a letter to Dear Abbey in which a wife claimed to have given birth 308 days after a brief visit from her husband, who was serving in the Navy. The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. Given this information, the probability of a pregnancy lasting 308 days or longer is _____. The result suggests that the husband ( (is/is not) ) the father of the child.

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Definitions:

Psychoanalysis

A therapeutic approach primarily focusing on revealing and understanding the unconscious mind, originally developed by Sigmund Freud.

Specific Phobias

Any of the disorders characterized by extreme and irrational fear of a particular object or situation.

Classical Conditioning

A learning process that occurs when two stimuli are repeatedly paired: a response that is at first elicited by the second stimulus is eventually elicited by the first stimulus alone.

Repressed Event

A repressed event refers to a memory that has been unconsciously blocked due to being associated with a high level of stress or trauma.