Question

6.- Find the area under the standard normal distribution: to the left of z=-1.55.

Answer 1

`P(z<-1.55)=0.0606`

Explanation:

For this case we want to find this probability:

`P(z<-1.55)`

Because they want the area to the left of the value. We need to remember that the normal standard distribution have a mean of 0 and a deviation of 1.

We can use the following excel code: =NORM.DIST(-1.55,0,1,TRUE)

And we got:

`P(z<-1.55)=0.0606`

The other possibility is use the normal standard table and we got a similar result.