Battery Life a Certain Brand of Batteries Has a Lifetime That

question 19

Short Answer

Battery Life
A certain brand of batteries has a lifetime that has a normal distribution with a mean of 3,750 hours and a standard deviation of 300 hours. ​ ​
-{Battery Life Narrative} What proportion of these batteries will last between 3,800 and 4,100 hours?

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Definitions:

Relevant Range

The range of activity within which the assumptions about fixed and variable costs in cost-volume-profit analysis are valid.

Fixed Costs

Expenses that do not change with the level of production or sales, such as rent, salaries, and insurance.

Contribution Margin

The difference between sales revenue and variable costs, representing the amount that contributes towards covering fixed costs and generating profit.

Weighted Average

A calculation that takes into account the varying degrees of importance of the numbers in a data set, used in financial analysis and grading.