Question : The average of 36 results is 18. If 2 is subtracted from each result, what will be the new average of the results?
Option 1: 9
Option 2: 16
Option 3: 17
Option 4: 17.5
Correct Answer: 16
Solution : An average of 36 results = 18 Sum of 36 results = 36 × 18 = 648 Let the new average be $x$. According to the question, 36$x$ = 648 – 36 × 2 ⇒ 36$x$ = 648 – 72 ⇒ 36$x$ = 576 ⇒ $x$ = 16 Hence, the correct answer is 16.
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Question : The average of some natural numbers is 15. If 30 is added to the first number and 5 is subtracted from the last number, the new average becomes 17.5. What is the total number of natural numbers?
Question : What is the sum of the digits of the least number which when divided by 15,18, and 36 leaves the same remainder 9 in each case and is divisible by 11?
Question : The mean of 9 observations is 16. When one more observation is included, the new mean becomes 17. What is the value of the 10th observation?
Question : The average of 25 results is 20. The average of the first 12 results is 15 and that of the last 12 results is 18. Then the 13th result is:
Question : The average of 25 results is 20. The average of the first 12 results is 15 and that of the last 12 results is 18. Then, the 13th result is:
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