Instruction 7.3 The Lifetimes of a Certain Brand of Light Bulbs Are

question 5

Short Answer

Instruction 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 Instruction 7.3,what is the probability that the sample mean lifetime is more than 1,550 hours?

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Oceangoing Vessel

A ship designed and equipped to travel across oceans.

Merchant's Firm Offer

A legal concept in commercial law where a merchant offers to sell goods in a written and signed promise that the offer will remain open and cannot be revoked for a certain period of time.

Lease

A contractual agreement by which one party conveys property, land, or services to another for a specified time, usually in return for a periodic payment.

Reasonable Price

A price that is fair and acceptable based on the context of the market, product, or service being provided.