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

question 73

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: More than 1,200 hours?

• A).3012
• B).3679
• C).4345
• D).6988

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Definitions:

Levels Minus One

In analysis of variance (ANOVA), it refers to the number of levels in a factor minus one, which dictates the number of comparisons that can be made.

Interaction Effect

Occurs in an analysis when the effect of one independent variable on a dependent variable differs across levels of another independent variable.

Mean Square

The average of the squares of the deviations or differences from the mean, often used in variance and regression analysis.

Within-Group Variance

The measure of how much the data points in a single group vary or deviate from the mean of that group.