Statistics
posted by Peter on .
Maria and Zoe are taking Biology 105 but are in different classes. Maria's class has an average of 78% with a standard deviation of 5% on the midterm, whereas Zoe's class has an average of 83% with a standard deviation of 12%. Assume that scores in both classes follow a normal distribution.
A. Convert Maria's midterm score of 84 to a standard z score.
which is correct?
a. 0.083
b. 0.5
c. 0.2
d. 1.2
e. 6
B Convert Zoe's midterm score of 89 to a standard z score.
a. 1.2
b. 0.5
c. 6
d. 0.917
e. 2.2
C. Who did better relative to her class?
a. Maria
b. Zoe
c. They performed the same.
d. Neither
e. Cannot determine

I had maria's zscore as (8479)/5 = 1.2
and Zoe's as 0.5
what does that mean?
Whose score is closest to the class average? 
i have no idea

Since the Z score measures deviation from the mean, the smallest Z score is closest to the mean.
I hope this helps a little more. Thanks for asking. 
c. is maria

a
e 
a)= 1.2
b)=0.5
c) maria