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You gave a reading test of test items to a small group of pupils and obtained the following scores: 15 12 20 21 16 13 10 15 12 20
a. What is the mean score of the group?
b. Add 3 to each score. What is the effect on the mean of the group?
c. Subtract 4 from each score. What is the effect on the mean of the group?
d. Divide each score by 5. What is the effect on the mean of the group?
e. Multiply cach group by 2. What is the effect on the mean of the group?
f. What can you conclude regarding the effect on the mean of arithmetical operations performed on the scores?
g. Show that the sum of the deviations (EX) in the above problem is zero. 20 21 16 13 10 15 12 20
Sagot :
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