The mean of the following observation is 12. The observations are x, x+1, x+3, x+7 and x+9. Find (i) The value of x. (ii) The mean of first three observations.
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(i) x + (x+1) + (x+3) + (x+7) + (x+9)
______________________ =12
5
Add the 'numbers' and 'X'
5x + 20 = 12×5
5x + 20 = 60
5x = 60 - 20
= 40
x = 40/5
=8
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