When 15 is included in a list of natural numbers, their mean is increased by 2. When 1 included in this new list, the mean of the numbers in the new list is decreased by 1. How many numbers were there in the original list?
(a) 4 (b) 5 (c) 6 (d) 8
Question ID - 50869 | SaraNextGen Top Answer When 15 is included in a list of natural numbers, their mean is increased by 2. When 1 included in this new list, the mean of the numbers in the new list is decreased by 1. How many numbers were there in the original list?
(a) 4 (b) 5 (c) 6 (d) 8
When 15 is included in a list of natural numbers, their mean is increased by 2. When 1 included in this new list, the mean of the numbers in the new list is decreased by 1. How many numbers were there in the original list?
(a) 4 (b) 5 (c) 6 (d) 8
Let there be 
numbers in the original list and let their mean be 
Then, sum of 
numbers = 
And, 
Solving 
we get 