The usable lifetime of a particular type of battery is normally distributed with a mean of 1,100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to K-Mart.
What is the mean of the sampling distribution of ?
______________
What is the standard deviation?
______________
What is the probability the average usable lifetime of these 400 batteries is between 1,097 and 1,104 days?
______________

Question

The usable lifetime of a particular type of battery is normally distributed with a mean of 1,100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to K-Mart.
What is the mean of the sampling distribution of  ?
______________
What is the standard deviation?
______________
What is the probability the average usable lifetime of these 400 batteries is between 1,097 and 1,104 days?
______________

Quizplus · Accepted Answer

The Answer of The usable lifetime of a particular type of battery is normally distributed with a mean of 1,100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to K-Mart.
What is the mean of the sampling distribution of  ?
______________
What is the standard deviation?
______________
What is the probability the average usable lifetime of these 400 batteries is between 1,097 and 1,104 days?
______________

The Usable Lifetime of a Particular Type of Battery Is