Question

A population has a mean of 24.8 and a standard deviation of 4.2. If `x_i =19`, what is the `z`-value?

Answer 1

`z=-1.38`

Explanation:

Given -
Mean `barx=24.8`
Standard Deviation `=4.2`

`x_i=19`

`z=(x-barx)/sigma`
`z=(19-24.8)/4.2=(-5.8)/4.2=-1.38`
`z=-1.38`