Question : What will be the average of the first 4576 odd numbers?
Correct Answer 4576
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 given numbers
The first 4576 odd numbers are
1, 3, 5, 7, 9, . . . . 4576 th terms
Calculation of the sum of the first 4576 odd numbers
We can find the sum of the first 4576 odd 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 4576 odd 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 first 4576 odd number,
n = 4576, a = 1, and d = 2
Thus, sum of the first 4576 odd numbers
S4576 = 4576/2 [2 × 1 + (4576 – 1) 2]
= 4576/2 [2 + 4575 × 2]
= 4576/2 [2 + 9150]
= 4576/2 × 9152
= 4576/2 × 9152 4576
= 4576 × 4576 = 20939776
⇒ The sum of first 4576 odd numbers (Sn) = 20939776
Shortcut Method to find the sum of first n odd numbers
Thus, the sum of first n odd numbers = n2
Thus, the sum of first 4576 odd numbers
= 45762 = 20939776
⇒ The sum of first 4576 odd numbers = 20939776
Calculation of the Average of the first 4576 odd numbers
Formula to find the Average
Average = Sum of given numbers/Number of numbers
Thus, The average of the first 4576 odd numbers
= Sum of first 4576 odd numbers/4576
= 20939776/4576 = 4576
Thus, the average of the first 4576 odd numbers = 4576 Answer
Shortcut Trick to find the Average of the first n odd numbers
The average of the first 2 odd numbers
= 1 + 3/2
= 4/2 = 2
Thus, the average of the first 2 odd numbers = 2
The average of the first 3 odd numbers
= 1 + 3 + 5/3
= 9/3 = 3
Thus, the average of the first 3 odd numbers = 3
The average of the first 4 odd numbers
= 1 + 3 + 5 + 7/4
= 16/4 = 4
Thus, the average of the first 4 odd numbers = 4
The average of the first 5 odd numbers
= 1 + 3 + 5 + 7 + 9/5
= 25/5 = 5
Thus, the average of the first 5 odd numbers = 5
Thus, the Average of the the First n odd numbers = n
Thus, the average of the first 4576 odd numbers = 4576
Thus, the average of the first 4576 odd numbers = 4576 Answer
Similar Questions
(1) If the average of 50 consecutive even numbers is 55, then find the smallest number.
(2) Find the average of the first 2864 even numbers.
(3) Find the average of even numbers from 10 to 432
(4) What will be the average of the first 4046 odd numbers?
(5) Find the average of the first 1815 odd numbers.
(6) Find the average of the first 2252 even numbers.
(7) Find the average of the first 3154 even numbers.
(8) Find the average of even numbers from 8 to 900
(9) Find the average of the first 2973 even numbers.
(10) What will be the average of the first 4664 odd numbers?