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

question 23

Short Answer

SCENARIO 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 Scenario 7-3,the probability is 0.15 that the sample mean lifetime is more than how many hours?

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Definitions:

Upper South

The Upper South traditionally refers to the northern tier of Southern states in the United States, which includes Virginia, Tennessee, Kentucky, and Missouri, characterized by a distinct socioeconomic and cultural identity.

Declaration of Causes

The Declaration of Causes is a document or proclamation issued to explain the reasons for a particular action or decision, often in the context of political or social movements.

Calling Up

The act of summoning individuals, typically for military service or jury duty, by official request or order.

Border States

During the American Civil War, the slave states that did not secede from the Union, including Delaware, Maryland, Kentucky, and Missouri.