The Life of a Light Bulb Is Exponentially Distributed with a Mean

question 9

Multiple Choice

The life of a light bulb is exponentially distributed with a mean of 1,000 hours. What is the probability that the bulb will last less than 800 hours?

• A) .6321
• B) .5507
• C) .7135
• D) .4493

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Definitions:

Resamples

The practice of randomly drawing samples from a dataset multiple times, each time potentially drawing the same observation more than once, to perform statistical inference.

Income

Money received, typically on a regular basis, for work or through investments.

Difference in Means

A statistical measure that evaluates the difference between the average values of two groups or sets.

Bootstrap Confidence Interval

A method of estimating the confidence interval for a parameter by resampling with replacement from the original data and recalculating the statistic of interest multiple times.