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Marks of 12 students in a unit test are given as 4, 21, 13, 17, 5, 9, 10, 20, 19, 12, 20, 14. Assume a mean and calculate the arithmetic mean of the data. Assume another number as mean and calculate the arithmetic mean again. Do you get the same result? Comment​

Answer :

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mean = 13.67

Step-by-step explanation:

observations = 4, 21, 13, 17, 5, 9, 10, 20, 19, 12, 20, 14

mean = sum of observations ÷ numbers of observations

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sum of observation = 4+21+13+17+5+9+10+20+19+12+20+14

= 164

numbers of observation = 12

mean = 164 ÷ 12

= 13.67