Question:
Find the average of even numbers from 4 to 1624
Correct Answer
814
Solution And Explanation
Solution
Method (1) to find the average of the even numbers from 4 to 1624
Shortcut Trick to find the average of the given continuous even numbers
The even numbers from 4 to 1624 are
4, 6, 8, . . . . 1624
After observing the above list of the even numbers from 4 to 1624 we find that the difference between two consecutive terms are equal. This means the list of the even numbers from 4 to 1624 form an Arithmetic Series.
In the Arithmetic Series of the even numbers from 4 to 1624
The First Term (a) = 4
The Common Difference (d) = 2
And the last term (ℓ) = 1624
The average of the numbers forming an Arithmetic Series
= The first term (a) + The last term (ℓ)/2
⇒ The average of numbers forming an Arithmetic Series = a + ℓ/2
Thus, the average of the even numbers from 4 to 1624
= 4 + 1624/2
= 1628/2 = 814
Thus, the average of the even numbers from 4 to 1624 = 814 Answer
Method (2) to find the average of the even numbers from 4 to 1624
Finding the average of given continuous even numbers after finding their sum
The even numbers from 4 to 1624 are
4, 6, 8, . . . . 1624
The even numbers from 4 to 1624 form an Arithmetic Series in which
The First Term (a) = 4
The Common Difference (d) = 2
And the last term (ℓ) = 1624
The Average of the given numbers
= Sum of the given numbers/Total number of given numbers
Thus, to find the average of the given numbers, first, we need to find their sum and the total number of given numbers
Finding the number of terms
For an Arithmetic Series, the nth term
an = a + (n – 1) d
Where
a = First term
d = Common difference
n = number of terms
an = nth term
Thus, for the given series of the even numbers from 4 to 1624
1624 = 4 + (n – 1) × 2
⇒ 1624 = 4 + 2 n – 2
⇒ 1624 = 4 – 2 + 2 n
⇒ 1624 = 2 + 2 n
After transposing 2 to LHS
⇒ 1624 – 2 = 2 n
⇒ 1622 = 2 n
After rearranging the above expression
⇒ 2 n = 1622
After transposing 2 to RHS
⇒ n = 1622/2
⇒ n = 811
Thus, the number of terms of even numbers from 4 to 1624 = 811
This means 1624 is the 811th term.
Finding the sum of the given even numbers from 4 to 1624
The sum of all terms (S) in an Arithmetic Series
= n/2 (a + ℓ)
Where, n = number of terms
a = First term
And, ℓ = Last term
Thus, the sum of all terms (S) of the given even numbers from 4 to 1624
= 811/2 (4 + 1624)
= 811/2 × 1628
= 811 × 1628/2
= 1320308/2 = 660154
Thus, the sum of all terms of the given even numbers from 4 to 1624 = 660154
And, the total number of terms = 811
Since, the average of the given numbers
= Sum of the given numbers/Total number of given numbers
Thus, the average of the given even numbers from 4 to 1624
= 660154/811 = 814
Thus, the average of the given even numbers from 4 to 1624 = 814 Answer
Similar Questions
(1) Find the average of the first 2148 odd numbers.
(2) What is the average of the first 1438 even numbers?
(3) Find the average of even numbers from 8 to 1128
(4) Find the average of even numbers from 10 to 1594
(5) Find the average of odd numbers from 7 to 1099
(6) Find the average of the first 3751 odd numbers.
(7) Find the average of even numbers from 10 to 1436
(8) Find the average of even numbers from 6 to 962
(9) Find the average of odd numbers from 15 to 1415
(10) Find the average of the first 3706 even numbers.