A P/OM Student Has Purchased a Four-Function Calculator for Use

question 57

Multiple Choice

A P/OM student has purchased a four-function calculator for use during exams.This calculator is perfectly reliable except for two parts: its microchip,which has a failure rate of one in every twenty hours of operation; and its battery,which has a failure rate of one in every ten hours of operation.Also,on average the battery will fail in five hours,with a standard deviation of 30 minutes.Assuming that a new battery has just been installed,what is the probability that the calculator will perform reliably during a one-hour exam?

• A)0.800
• B)0.855
• C)0.900
• D)0.950
• E)1.850

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Definitions:

Slide

An error in which the entire number is moved one or more spaces to the right or the left, such as writing $542.00 as $54.20 or $5,420.00.

Accuracy

The degree to which the result of a measurement, calculation, or specification conforms to the correct value or a standard.

Posting

The act of recording financial transactions in the ledger of an accounting system.

Transaction

An agreement or exchange between two parties that involves the buying, selling, or trading of goods, services, or financial instruments.