# What is the z-score of sample X, if #n = 81, mu= 43, St. Dev. =90, and E[X] =57#?

##### 1 Answer

Nov 21, 2016

The z-score is

#### Explanation:

The z-score for a sample mean is

Therefore,

Nov 21, 2016

The z-score is

The z-score for a sample mean is

Therefore,

1185 views
around the world

You can reuse this answer

Creative Commons License

Creative Commons License