When a number x is added to the set of numbers 5,7,8,12,610,11 the new mean is 9. Calculate the value of x
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5 + 7 + 8 + 12 + 6 + 10 + 11 = 59
Sum of all values is 59
no. of values is 8 (7+1)
Mean = Sum of all values / no. of values
So mean after including the term X is
9 = ( 59 + X ) / 8
72 = 59 + X
X = 13
Sum of all values is 59
no. of values is 8 (7+1)
Mean = Sum of all values / no. of values
So mean after including the term X is
9 = ( 59 + X ) / 8
72 = 59 + X
X = 13
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