Posted by emily on .
probability and statistics
a z score is z = x  xbar divided by s
which is standard deviation
s = 6.36
x = ?
xbar = 54.8
the x is all the data sub. from 54.8 individually which i came up with 1.2 and divided it by 6.36 and the number is .1886.....and the answer in the back of the book is 2.05 so my answer is wrong do you think you could the answer with this information?

statistics 
PsyDAG,
First, it is better to title your post with the subject area, in this case, statistics.
"xbar" = mean
You need either the value for Z or x to solve your equation. From your description, I'm not quite sure what you did.
However, Z = .1886 is very close to the mean, less than a standard deviation away.
I hope this helps. Thanks for asking.