Asked by Heather
The lifetime of a disk drive head is normally distributed with a population mean of 1000 hours and standard deviation of 120 hours. Determine the probability that the average lifetime for 9 disk drives will exceed 940 hours. Need to see work!
Answers
Answered by
MathGuru
Use z-scores:
z = (x - mean)/(sd/√n)
With your data:
z = (940 - 1000)/(120/√9)
Finish the calculation, then determine your probability using a z-table.
z = (x - mean)/(sd/√n)
With your data:
z = (940 - 1000)/(120/√9)
Finish the calculation, then determine your probability using a z-table.
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.