If Light Bulbs Have Lives That Are Normally Distributed with a Mean

question 22

Multiple Choice

If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?

• A) About 25%
• B) About 50%
• C) About 75%
• D) About 68%

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Definitions:

Standardized Scoring

A method of assessment that uses uniform procedures to ensure consistent scoring across different evaluators or test instances.

Structured Interviews

Structured interviews are a systematic way of asking questions in which the interviewer follows a set sequence and the questions are predetermined to ensure consistency across all interviews.

Subjective Judgments

Subjective Judgments are opinions or decisions based on personal feelings, tastes, or opinions rather than objective facts or evidence.

Unstructured Interviews

Unstructured Interviews are qualitative interviews without a set script or format, allowing for open-ended responses and a flexible discussion.