TABLE 7-3 The Lifetimes of a Certain Brand of Light Bulbs Are

question 117

Short Answer

TABLE 7-3
The lifetimes of a certain brand of light bulbs are known to be normally distributed with a mean of 1,600 hours and a standard deviation of 400 hours. A random sample of 64 of these light bulbs is taken.
-Referring to Table 7-3, what is the probability that the sample mean lifetime is more than 1,550 hours?

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Political Map

A type of map that shows governmental boundaries of countries, states, and counties, important cities, and major bodies of water primarily focused on the political features.

Democratic Strongholds

Regions or areas where the Democratic Party has sustained majority support or dominance, often over extended periods.

Electoral College

The body of electors established by the Constitution of the United States, responsible for electing the president and vice president.

American South

A region in the United States characterized by its unique cultural, historical, and economic features, often associated with the Confederate states during the Civil War.