The Life (In Hours)of Light Bulbs of a Certain Brand

question 2

Multiple Choice

The life (in hours) of light bulbs of a certain brand is normally distributed with mean 1000 and standard deviation 100.What percentage of such bulbs will burn more than 950 hours?

• A) 40.95
• B) 72.15
• C) 68.34
• D) 65.54
• E) 69.15

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Definitions:

Predominate

To be the strongest or main element; to have a commanding or dominant position.

2-Methylbutane

An organic compound, also known as isopentane, characterized by a branched chain of carbon atoms, used as a refrigerant and in organic synthesis.

2-Methylbut-1-ene

An alkene with the formula C5H10, featuring a double bond at the first position and a methyl group at the second position.

Elimination Products

Substances formed from the removal of atoms or groups in a molecule, often resulting in the formation of double or triple bonds.