anonymous 3 years ago Statistics: $\mu=28$ $\sigma=5$ If $P(z\le z_0)=0.12$ How do I use the attached table to come to the conclusion that $z_0=-1.175$?

1. anonymous

2. Zarkon

look up .12 in the middle of the table

3. Zarkon

or the numbers closest to .12

4. anonymous

You mean here?

5. Zarkon

no...the middle of the table...middle of the paper

6. anonymous

No I think you mean here

7. anonymous

right?

8. Zarkon

no

9. anonymous

Where?

10. Zarkon

middle! ... don't look along the edge yet

11. anonymous

here?

12. Zarkon

yes...but there is another number that is really close to .12

13. anonymous

.1190

14. Zarkon

yes...what are the z values for those 2 numbers

15. anonymous

but how did they come to the conclusion that z_0=-1.175?

16. Zarkon

answer my last question first

17. anonymous

-1.1 and .07 and .08....ah I see Therefore -1.75 since it between .1190 and .1210

18. Zarkon

-1.17 and -1.18 take average of the two gives -1.175