A Certain Brand of Flood Lamps Has a Lifetime That

question 72

Short Answer

A certain brand of flood lamps has a lifetime that is normally distributed with a mean of 3,750 hours and a standard deviation of 300 hours.
A)What proportion of these lamps will last for more than 4,000 hours?
B)What lifetime should the manufacturer advertise for these lamps in order that only 2% of the lamps will burn out before the advertised lifetime?
____________________ hours (Remove all commas from your answer before submitting).

• A)What proportion of these lamps will last for more than 4,000 hours?
• B)What lifetime should the manufacturer advertise for these lamps in order that only 2% of the lamps will burn out before the advertised lifetime?
• ____________________ hours (Remove all commas from your answer before submitting).

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Definitions:

Short-Run Total Cost Function

A formula showing the total cost of production when at least one factor of production is fixed in the short run.

Average Cost

Calculated by dividing the total cost of production by the number of goods produced.

Quantity of Output

The total amount of goods or services produced by a company, industry, or country.

Production Function

A mathematical model describing the relationship between the inputs used in production and the output of goods or services produced.