If the mean of x,x+2,x+4,+6and x+8 is 11 . Find the mean of first three observation
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Answer:
9
Step-by-step explanation:
Since mean = 11
=>11 = x+(x+2)+(x+4)+(x+6)+(x+8)/5
=>11 x 5 = 5x + 20
=>55-20 = 5x
=> x = 35/5 = 7
Therefore, the first 3 numbers are 7, 7+2,7+4
Therefore mean of first three observations is 7+9+11/3
= 27/3
=9
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