The mean of 7,9,x+3,12,2x-1and 3 is 9 .Find the value of x
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Formula of mean = Sum of Observations / Number of Observations
7+9+x+3+12+2x-1+3 / 7 = 9
34+x+2x-1 / 7 = 9
33+3x / 7 = 9
= Now we will transpose 7 from LHS to RHS
33+3x = 63
3x = 63 - 33 (Transposed +33 from LHS to RHS)
= 30
3x = 30
x = 30/3 (Transopsed *3 from LHS to RHS)
x = 10
Step-by-step explanation:
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