The usable lifetime of a particular type of battery is normally distributed with a mean of 1,100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to K-Mart.
What is the mean of the sampling distribution of 
?
______________
What is the standard deviation?
______________
What is the probability the average usable lifetime of these 400 batteries is between 1,097 and 1,104 days?
______________
Definitions:
Liquidated Debt
A debt of a specific, fixed amount that is acknowledged between parties or determined through a legal process.
Dispute
A disagreement, conflict, or controversy, often necessitating resolution through discussion, negotiation, or legal action.
Money Owed
Refers to funds that are due to be paid by one party to another under the terms of a contract or as a recognized debt.
Unforeseen Circumstances Rule
A principle in contract law that allows parties to a contract to be excused from fulfilling their obligations due to circumstances that were unforeseeable at the time the contract was made.
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