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

question 39

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 0.20 that the sample mean lifetime differs from the population mean lifetime by at least how many hours?

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Definitions:

Extra Electrons

Additional electrons that surpass the baseline number expected in an atom or molecule, often leading to negative charge and chemical reactivity.

Outermost Shell

Refers to the outermost layer of electrons surrounding an atomic nucleus.

Atomic Number

The atomic number is the number of protons found in the nucleus of an atom, determining the chemical properties of the element and its place in the periodic table.

Electrons

Subatomic particles with a negative charge, found orbiting the nucleus of an atom.