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?

Identify and apply appropriate software for specific personal and professional tasks, such as photo editing and document creation.

Utilize spreadsheet tools to analyze and visualize data effectively.

Choose appropriate chart types to accurately represent data for clear communication.

Design and implement databases for efficient data entry and management.