Compact Fluorescent Bulbs Are More Energy-Efficient Than Incandescent Bulbs, but They

question 33

Multiple Choice

Compact fluorescent bulbs are more energy-efficient than incandescent bulbs, but they take longer to reach full brightness. The time it takes for a compact fluorescent bulb to reach full brightness is normally distributed with mean 29.9 seconds and standard deviation 4.9 seconds. Find and interpret the z-score for x=26.1.

• A) z=0.71: the time to reach full brightness is 0.71 standard deviations above the mean.
• B) z=0.71: the time to reach full brightness is 0.71 standard deviations below the mean.
• C) z=-0.78 : the time to reach full brightness is 0.78 standard deviations below the mean.
• D) z=-0.78: the time to reach full brightness is 0.78 standard deviations above the mean.

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Definitions:

Careless Management

An approach to management characterized by a lack of attention or consideration for details, often resulting in mistakes or poor performance.

Poorly Maintained Machinery

Equipment and machineries that haven't been kept in good working condition through regular checks and repairs, often leading to inefficiencies or hazards.

Pareto Analysis

A statistical technique in decision-making used to select a limited number of tasks that produce significant overall effect, often referred to as the 80/20 rule.

Benchmarking

The practice of comparing business processes and performance metrics to industry bests and best practices from other companies.