Question

If the mean of the observation x, x+3,x+5,x+7,x+10is 9, the mean of the last three observation is

Answer 1

Answer:

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Answer 2

Answer:

Mean = Sum of all observations/ No. of observations

x+x+3+x+5+x+7+x+10 / 5 = 9

5x+25/5 = 9

5x+25 = 9×5

5x+25 = 45

5x = 45-25

5x = 20

x = 20/5

x = 4

Mean of last three observations = x+5+x+7+x+10 / 3

= 4+5+4+7+4+10/3

= 34/3

= 11.34