If X, the Time (In Minutes)to Complete an Change Job $\le$

question 14

Multiple Choice

If x, the time (in minutes) to complete an change job at certain auto service station, is uniformly distributed over the interval 20 to 30, inclusively (20 $\le$ x $\le$ 30) , then the probability that an oil change job is completed in 25 to 28 minutes, inclusively, i.e., P(25 $\le$ x $\le$ 28) is __________________.

• A)0.250
• B)0.500
• C)0.300
• D)0.750
• E)81.000

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Definitions:

Price Variance

A variance that is computed by taking the difference between the actual price and the standard price and multiplying the result by the actual quantity of the input.

Direct Labor-Hours

The total hours worked by direct labor employees on the production of goods or delivery of services.

Standard Cost System

An accounting method that uses standard costs for direct materials, labor, and overhead to assess performance and control costs.

Price Variance

The difference between the actual price paid for a good or service and its expected price, often analyzed in budgeting and cost management.