DarkendSinz30 Group Title A Math test has a mean of 39 and standard deviation of 18.0. Find the corresponding z scores for: I. a test score of 31 II. a test score of 100 Please show all of your work one year ago one year ago

1. sirm3d Group Title

the z score formula is $z=\frac{ obsv - mean }{ std.dev. }$ i'll leave the computation to you. post your answers here.

2. DarkendSinz30 Group Title

what is obsv?

3. DarkendSinz30 Group Title

z=31-39/18.0 correct?

4. DarkendSinz30 Group Title

z=100-39/18.0 = 3.4

5. DarkendSinz30 Group Title

z=31-39/18.0=.44

6. DarkendSinz30 Group Title

is this right so far?

7. sirm3d Group Title

there is a negative sign

8. sirm3d Group Title

I. z = -0.44 II. z = 3.4

9. DarkendSinz30 Group Title

okay so I was on the right track then just forgot the negative sign

10. sirm3d Group Title

just be careful with the signs.

11. DarkendSinz30 Group Title

Thank you so much for the help.