# The mean annual cost of car insurance is $939. The standard deviation is $300. What is the standard deviation of x-bar?

##
You have been asked to compute the probability that a simple random sample of car insurance policies of size 100 will have a sample mean within $25 of the population mean.

You have been asked to compute the probability that a simple random sample of car insurance policies of size 100 will have a sample mean within $25 of the population mean.

##### 1 Answer

Jun 27, 2018

SD of

#### Explanation:

In this case,

SE =