Alfred missed a class test. For the test that Alfred missed, the class mean was...
Aubrey Hendricks
Answered question
2022-01-28
Alfred missed a class test. For the test that Alfred missed, the class mean was 18 and the standard deviation was 4. If his teacher is going to give Alfred a mark based on his standard score, what mark should Alfred receive?
Answer & Explanation
Lily Thornton
Beginner2022-01-29Added 19 answers
Explanation:
Since his average z-score is 1.6 standard deviations above the class mean, the teacher has to convert that score into a number of points above the mean.
First, the teacher can multiply the standardized score by the standard deviation to find how many points above/below the mean, his score will be:
1.6*4=6.4
Then, add this number to the mean to find his score:
18+6.4=24.4
The teacher will give Alfred a score of 24.4.
Since his average z-score is 1.6 standard deviations above the class mean, the teacher has to convert that score into a number of points above the mean.
First, the teacher can multiply the standardized score by the standard deviation to find how many points above/below the mean, his score will be:
1.6*4=6.4
Then, add this number to the mean to find his score:
18+6.4=24.4
The teacher will give Alfred a score of 24.4.
