Question : What is the average of the first 13 odd numbers?
Option 1: 14
Option 2: 13.5
Option 3: 12
Option 4: 13
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Correct Answer: 13
Solution : The sum of the first 'n' odd natural numbers = n$^2$ Average = $\frac{\text{Sum of all observation}}{\text{Total number of observation}}$ The sum of the first '13' odd natural numbers = (13)$^2$ = 169 ⇒ Average = $\frac{169}{13}$ = 13 $\therefore$ The average of the first '13' odd natural is 13. Hence, the correct answer is 13.
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Question : The average of 7 consecutive odd numbers is A. If the next 3 and the previous 2 odd numbers to these 7 odd numbers are also included, what is the new average of these 12 consecutive odd numbers?
Question : What is the average of the first 10 even numbers?
Question : The average of five consecutive odd numbers is 15. What is the smallest of these five numbers?
Question : The average of 4 numbers is 45. The average of the first two numbers is thrice the average of the other two numbers. What is the sum of the first two numbers?
Question : The average of seven consecutive even numbers is 12. What will be the new average if the next even number is also considered?
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