Question

The mean of 5 numbers is 7. if one more number is incuded the mean increases by 2. what is the number included

Answer 1

Answer:

Here it is,

Step-by-step explanation:

Mean =X = 27

No of observations = 7

 Sum of observations =  = 27 x 7 = 189

Let the included number be x

New Mean X' = 28

New number of observations = 8

New sum of observations =   28 x 8

                                             = 224 which is equal to  189+x

                                                    Thus x= 224-189 = 35