Asked by eimear
The yearly mileage accumulated by an automobile in a large car rental company’s fleet is normal with mean 18000 kilometres and standard deviation 1700 miles. At the end of the year the company sells 80% of its cars, keeping the 20% with the lowest mileage. Do you think a car whose year-end mileage is 17400 k.m. is likely to be kept?
Answers
Answered by
Steve
This is just Z table stuff. You can play around with the values at
http://davidmlane.com/hyperstat/z_table.html
http://davidmlane.com/hyperstat/z_table.html
Answered by
PsyDAG
Another method.
Z = (score-mean)/SD = (17400-18000)/1700 = ?
Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability related to the Z score.
Z = (score-mean)/SD = (17400-18000)/1700 = ?
Look in the back of your statistics textbook for a table called something like “area under normal distribution” to find the proportion/probability related to the Z score.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.