Question

1 The mean of 9 numbers is 40.One number twelve was excluded. Find the new mean ​

Answer 1

Step-by-step explanation:

formula , Average = sum of observation  / number of observation

given,

  Average of 9 numbers = 14

 Total number = 9

On the basis of the formula given above : -

14 = ( sum of 9 number ) / 9

14 x 9 = sum of 9 numbers

126 = sum of 9 numbers

Now, one number 12 is excluded,

sum of 8 numbers = sum of 9 numbers - 12

sum of 8 numbers = 126 - 12

sum of 8 number = 114

Total numbers = 8

Therefore,

New average = 114 / 8

New average = 14.25

Answer 2

Answer:

12

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