A teacher finds that the test scores of a group of 40 students have a mean of 75 and a standard deviation of 10. If Anne has a test score of 88, what is Anne’s z-score?

z-score = (88 - 75)/10

= ....

z = (88-75)/(10/sqrt((40))

To find Anne's z-score, you need to calculate how many standard deviations away her score is from the mean of the group. The formula to calculate the z-score is:

z = (x - μ) / σ

where:
- z is the z-score
- x is the value you want to calculate the z-score for (Anne's score in this case)
- μ is the mean of the group
- σ is the standard deviation of the group

In this case, Anne's score is 88, the mean of the group is 75, and the standard deviation is 10. Plugging these values into the formula:

z = (88 - 75) / 10
z = 13 / 10
z = 1.3

Therefore, Anne's z-score is 1.3.