A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results
What is the sample mean service life for sample 2?
Definitions:
Standard Time
The established duration designed for the completion of a specific task, under normal working conditions and performance.
Time Study
A work measurement technique for recording the times of performing a task to establish a standard time for the activity by direct observation and timing.
Labour Standard
Labour standard represents the amount of time required to perform a job or part of a job at a defined level of performance, often used in planning and evaluating labor efficiency.
Work Sampling
A statistical technique used to estimate how much time workers spend on various activities during their workday.
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