The Average Life Expectancy of Dishwashers Produced by a Company

question 136

Short Answer

The average life expectancy of dishwashers produced by a company is 6 years with a standard deviation of 8 month Assume that the lives of dishwashers are normally distributed.
a. What is the probability that a randomly selected dishwasher will have a life expectancy of at least 7 years?
b. Dishwashers that fail operating in less than 4 1/2 years will be replaced free of charge. What percent of dishwashers are expected to be replaced free of charge?
c. What are the minimum and the maximum life expectancy of the middle 95% of the dishwashers' lives? Give your answer in months.
d. If 155 of this year's dishwasher production fail operating in less than 4 years and 4 months, how many dishwashers were produced this year?

---

Definitions:

Wastewater

Water that has been used and contaminated by human activity, which includes residential, industrial, and commercial waste liquids.

Dissolved Salts

Ionic substances that are broken down into constituent ions in a solution, primarily found in bodies of water.

Brackish Water

Water that has more salt than freshwater but less than seawater, often resulting from the mixing of sea and freshwater.

Waterless Conditions

Environments or situations characterized by a lack of water or moisture.