Question

$can \: ya \: all \: please \: help$
The mean of 10 numbers is 12.5. The mean of first six numbers is 15 and the mean of last five numbers is 10. Find the sixth number.

Answer 1

Answer:

15

Step-by-step explanation:

Given, Mean of 10 numbers is 12.5.

Then, Sum of 10 numbers = 10 * 12.5 = 125.

(i)

Given, Mean of first 6 numbers = 15.

Then, Sum of first 6 numbers = 6 * 15 = 90.

(ii)

Given, Mean of last five numbers = 10.

Then, Sum of last 5 numbers = 5 * 10 = 50.

Now,

∴ Sixth number = (Sum of 1st 6 numbers + Sum of last 5 numbers) - Sum of 10 numbers

= (90 + 50) - 125

= 140 - 125

= 15.

Therefore, Sixth number = 15.

Hope it helps!

Answer 2

Answer:

15

Step-by-step explanation:

mean of 10 numbers is 12.5

Sum = 125

Mean of first 6 numbers =15

Sum = 90

Mean of first 5 numbers = 10

Sum = 50.

Sixth mean = 140 -  125

                  = 15