Question

the mean of 40 numbers was found to be 38.later on it was detected that a number 56. was misread as 36 find the correct mean of the given number.​

Answer 1

Answer:

38.5

Step-by-step explanation:

Mean = Sum of all observation/Total no. of observation

But in this question observtion are misplacing so

New formula,

New Mean=Sum of all observation - (wrong observation)+(Right observation)

Sum of all observation=40*38

                                    =1520

New mean =1520 - 36+56 /40

                   =1520+20/40

                  =1540/40

                  =38.5