Question : Find the average of the first 3414 even numbers.
Correct Answer 3415
Solution & Explanation
Explanation
Method to find the average
Step : (1) Find the sum of given numbers
Step: (2) Divide the sum of given number by the number of numbers. This will give the average of the given numbers
The first 3414 even numbers are
2, 4, 6, 8, . . . . 3414 th terms
Calculation of the sum of the first 3414 even numbers
We can find the sum of the first 3414 even numbers by simply adding them, but this is a bit difficult. And if the list is long, it is very difficult to find their sum. So, in such a situation, we will use a formula to find the sum of given numbers that form a particular pattern.
Here, the list of the first 3414 even numbers forms an Arithmetic series
In an Arithmetic Series, the common difference is the same. This means the difference between two consecutive terms are same in an Arithmetic Series.
The sum of n terms of an Arithmetic Series
Sn = n/2 [2a + (n – 1) d]
Where, n = number of terms, a = first term, and d = common difference
In the series of the first 3414 even number,
n = 3414, a = 2, and d = 2
Thus, sum of the first 3414 even numbers
S3414 = 3414/2 [2 × 2 + (3414 – 1) 2]
= 3414/2 [4 + 3413 × 2]
= 3414/2 [4 + 6826]
= 3414/2 × 6830
= 3414/2 × 6830 3415
= 3414 × 3415 = 11658810
⇒ The sum of the first 3414 even numbers (S3414) = 11658810
Shortcut Method to find the sum of the first n even numbers
Thus, the sum of the first n even numbers = n2 + n
Thus, the sum of the first 3414 even numbers
= 34142 + 3414
= 11655396 + 3414 = 11658810
⇒ The sum of the first 3414 even numbers = 11658810
Calculation of the Average of the first 3414 even numbers
Formula to find the Average
Average = Sum of the given numbers/Number of the numbers
Thus, The average of the first 3414 even numbers
= Sum of the first 3414 even numbers/3414
= 11658810/3414 = 3415
Thus, the average of the first 3414 even numbers = 3415 Answer
Shortcut Trick to find the Average of the first n even numbers
(1) The average of the first 2 even numbers
= 2 + 4/2
= 6/2 = 3
Thus, the average of the first 2 even numbers = 3
(2) The average of the first 3 even numbers
= 2 + 4 + 6/3
= 12/3 = 4
Thus, the average of the first 3 even numbers = 4
(3) The average of the first 4 even numbers
= 2 + 4 + 6 + 8/4
= 20/4 = 5
Thus, the average of the first 4 even numbers = 5
(4) The average of the first 5 even numbers
= 2 + 4 + 6 + 8 + 10/5
= 30/5 = 6
Thus, the average of the first 5 even numbers = 6
Thus, the Average of the First n even numbers = n + 1
Thus, the average of the first 3414 even numbers = 3414 + 1 = 3415
Thus, the average of the first 3414 even numbers = 3415 Answer
Similar Questions
(1) What is the average of the first 1844 even numbers?
(2) Find the average of odd numbers from 5 to 1043
(3) What is the average of the first 940 even numbers?
(4) Find the average of odd numbers from 15 to 1565
(5) Find the average of even numbers from 12 to 1474
(6) What is the average of the first 81 even numbers?
(7) Find the average of the first 1090 odd numbers.
(8) Find the average of even numbers from 12 to 696
(9) Find the average of odd numbers from 5 to 131
(10) Find the average of the first 3355 even numbers.