TABLE 7-4 The Lifetimes of a Certain Brand of Light Bulbs Are

question 25

Essay

TABLE 7-4
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 7-4, 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:

Umami

One of the five basic tastes, described as savory or meaty, and associated with foods containing glutamate.

Meaty Taste

Describes a flavor profile reminiscent of meat, often rich and savory, referred to as umami in taste descriptions.

Taste Sensation

The perception derived from the chemical senses as food or other substances interact with taste receptors in the mouth.

Olfaction

The sense of smell, an important chemical sensing system in humans and animals for detecting environmental odors.