Question

The marks obtained by 10 students in an examination were as follows: 60, 65, 68, 70, 75, 73, 80, 70, 83, 86. Find mean deviation about the mean​

Answer 1

Answer:

73

Step-by-step explanation:

1. Add all the marks up:

        60+65+68+70+75+73+80+70+83+86 = 730

     

     2. Count all the participants:

          =10

Therefore the calculation shall be: 730/10 that gives us the average of the marks of the class are: 73 (mean).

Answer 2

6.4

{x = 730 , n=10 mean=73

calculate x-mean of all observation total is 64 then

mean deviation about mean = 64/10 =6.4

but I think question is wrong there are two 70 one of them would be another.