Question

The mean of 10 numbers is 12?5

Answer 1

Answer:

ANSWER

The sum of firs 6 numbers is  

=15×6

=90

Therefore

x  

1

​  

+x  

2

​  

+...x  

6

​  

=90 ...(i)

And  

The sum of last five number is  

=10×5

=50

Therefore

x  

10

​  

+x  

9

​  

+x  

8

​  

...x  

6

​  

=50 ...(ii)

Sum of all number is  

=12.5×10

=125 ...(iii)

Hence

i+ii

=140

=(x  

1

​  

+x  

2

​  

+....x  

10)

​  

+x  

6

​  

 

=125+x  

6

​  

 

Or  

x  

6

​  

=15.

Step-by-step explanation: