Question

Find the mean of the following esta 7, 8, 9, 10, 11, 12, 13, 15, 17,20​

Answer 1

mean = sum of data values/ no. of data values

= 7+8+9+10+11+12+13+15+17+20/10 = 122/10 = 12.2

another method:

let the rough avg be 10

then deviations of given data is

-3, -2, -1,0, 1,2 3,5,7,10

average = 22/10=2.2

actual average = 10+2.2 = 12.2 is avg of given data

Answer 2

Answer:

We will get the mean value of 7,8,9,10,11,12,13,15,17,20 is 12.2.

Step-by-step explanation:

• We have to evaluate the above expression by using the given data.

        Given data:- 7,8,9,10,11,12,13,15,17,20.

       To find:- Value of mean.

        Solution:-

• We know that mean is an arithmetic average of all numbers.

• it is the sum of all numbers divided by the total number of observations.

         $mean =\frac{\text { Sum of all number }}{\text { Total number of observation }}$

          Therefore, we get

           $\begin{array}{l}\text { mean }=\frac{7+8+9+10+11+12+13+15+17+20}{10} \\\\\text { mean }=\frac{122}{10} \\\\\text { mean }=\frac{61}{5} \\\\\text { mean }=12.2\end{array}$