The Expected (Mean)life of a Particular Type of Light Bulb

question 73

Multiple Choice

The expected (mean) life of a particular type of light bulb is 1,000 hours with a standard deviation of 50 hours.The life of this bulb is normally distributed. What is the probability that a randomly selected bulb would last fewer than 940 hours?

• A) 0.3849
• B) 0.8849
• C) 0.1151
• D) 0.6151
• E) 0.6563

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Definitions:

Flexible Budget Graphs

Visual representations that display the relationship between budgeted and actual results over a range of activity levels, helping to analyze performance.

Direct Labor Hours

The total hours worked by employees directly involved in the manufacturing process or providing services.

Budgeted Costs

Predicted or planned expenses that are outlined in a company's budget for a specific period.

Fabricating Department

The division within a manufacturing company where raw materials are assembled or processed into finished goods.