Question:
Find the average of even numbers from 4 to 962
Correct Answer
483
Solution And Explanation
Solution
Method (1) to find the average of the even numbers from 4 to 962
Shortcut Trick to find the average of the given continuous even numbers
The even numbers from 4 to 962 are
4, 6, 8, . . . . 962
After observing the above list of the even numbers from 4 to 962 we find that the difference between two consecutive terms are equal. This means the list of the even numbers from 4 to 962 form an Arithmetic Series.
In the Arithmetic Series of the even numbers from 4 to 962
The First Term (a) = 4
The Common Difference (d) = 2
And the last term (ℓ) = 962
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 962
= 4 + 962/2
= 966/2 = 483
Thus, the average of the even numbers from 4 to 962 = 483 Answer
Method (2) to find the average of the even numbers from 4 to 962
Finding the average of given continuous even numbers after finding their sum
The even numbers from 4 to 962 are
4, 6, 8, . . . . 962
The even numbers from 4 to 962 form an Arithmetic Series in which
The First Term (a) = 4
The Common Difference (d) = 2
And the last term (ℓ) = 962
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 962
962 = 4 + (n – 1) × 2
⇒ 962 = 4 + 2 n – 2
⇒ 962 = 4 – 2 + 2 n
⇒ 962 = 2 + 2 n
After transposing 2 to LHS
⇒ 962 – 2 = 2 n
⇒ 960 = 2 n
After rearranging the above expression
⇒ 2 n = 960
After transposing 2 to RHS
⇒ n = 960/2
⇒ n = 480
Thus, the number of terms of even numbers from 4 to 962 = 480
This means 962 is the 480th term.
Finding the sum of the given even numbers from 4 to 962
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 962
= 480/2 (4 + 962)
= 480/2 × 966
= 480 × 966/2
= 463680/2 = 231840
Thus, the sum of all terms of the given even numbers from 4 to 962 = 231840
And, the total number of terms = 480
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 962
= 231840/480 = 483
Thus, the average of the given even numbers from 4 to 962 = 483 Answer
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