Question

The average of 100 numbers is 44. If newly 25 numbers are join average of 125 numbers is 50. Find the average of 25 new numbers

Answer 1

Answer:

The average of first n natural numbers = (n+1)/2. The average of squares of first n natural numbers = (n+1)(2n+1)/6. The average of cubes of first n natural numbers = n(n+1)2/4. The average of odd numbers from 1 to n = (last odd number+1)/2.