The Lifetimes of Light Bulbs of a Particular Type Are

question 15

Short Answer

The lifetimes of light bulbs of a particular type are normally distributed with a mean of 270 hours and a standard deviation of 11 hours. What percentage of the bulbs have lifetimes that lie within 2 standard deviations of the mean on either side?

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Definitions:

Solids

Materials with a fixed shape and volume, characterized by strong intermolecular forces.

Density

A physical property defined as the mass per unit volume of a substance, often used to identify or characterize materials.

Volume

The amount of space that an object or substance occupies, measured in cubic units.

Mass

An assessment of how much matter an object holds, often measured in grams or kilograms.