Question

If mean of three observation x+2 x+4,x+6 is 15 then find x

Answer 1

Answer:

x = 11

Step-by-step explanation:

Mean = Sum of observations / No. of observations

Sum of observations = Mean * No. of observations

Given:

Mean of (x+2), (x+4) and (x+6) = 15

=> Sum of (x+2), (x+4) and (x+6) = 3*15 = 45

=> x + 2 + x + 4 + x + 6 = 45

=> 3x + 12 = 45

=> 3x = 33

=> x = 11

Answer 2

mean =no.of observation/total no of observation

X= x+2+x+4+x+6/3

15=3x+12/3

15×3=3x+12

45=3x+12

45-12=3x

33=3x

x=11

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