A computer is programmed to predict test scores and the following are the predicted

test scores for the 10 students listed below.

90 90 87 80 42 70 67 60 83 94

For each student find the error in their predicted score. Then calculate the average and

standard deviation of these errors. Comment briefly on how well the computer program

seems to be at predicting scores.Hint: use the interpretation of average and S.D. to

make this assessment.

So for standard deviation, I used this formula I found online: How To Calculate Standard Deviation by sonia

but I'm not sure what it means by "finding the error". Is this the margin of error number? Can someone describe the steps I need to take in order to solve this problem?