Forty students have completed a math test. The mean score was 60 and a mean absolute deviation was 12. The teacher has decided to adjust the scores by adding 5 points to each test score. Calculate the new mean and mean absolute deviation.

new mean = 65

new MAD= 12

Step-by-step explanation:

The teacher adds 5 points to each data. This action will simply increase the mean by 5 because each data have 5 more value. Let the number of data is x, then the new mean will be:

old mean = total score/x

new mean = (total score + 5*x) / x

new mean = (total score/x) + 5

new mean = old mean + 5 = 60 +5 = 65

Mean absolute deviation (MAD) is the average difference of each data with the mean. Each data increased by 5 and the mean is increased by 5 too. The difference will not be changed since both increased by 5. So, new MAD equal to old MAD.

chad should not have included the values (1, 2) and (3, 6) because that would mean he only had half a healing card.

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step-by-step explanation: