alleryWhat is the average of the whole numbers from 11 to 20?
- 16
- 16.5
- 15
- 15.5
Show answer and solution
Correct answer: D. 15.5
The ten numbers total 155, so the average is 15.5.
SSC CGL Averages — practice questions — page 2
Explore 50 free Averages questions in SSC CGL Quantitative Aptitude. Open each question or exercise to read its content, reference answers and available explanation.
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Showing questions 31–50 of 50.
What is the average of the whole numbers from 11 to 20?Read the answer and worked solution →The numbers 10, 15, x and 25 have an average of 17. Find x.Read the answer and worked solution →25 students average 60 marks. Five of them average 70. What is the average of the other 20?Read the answer and worked solution →Eight people average 60 kg. A ninth person weighing 69 kg joins. What is the new mean weight?Read the answer and worked solution →Ten numbers average 7. Each is reduced by 2 and then multiplied by 4. What is the new average?Read the answer and worked solution →The average of two numbers is 24 and they are in the ratio 3:5. What is the larger number?Read the answer and worked solution →Sets of 10, 20 and 30 numbers have averages 5, 8 and 10. What is the average of all 60 numbers?Read the answer and worked solution →Five readings average 20. A sixth reading is added and the average stays unchanged. What is the sixth reading?Read the answer and worked solution →How is the arithmetic mean of a set of values calculated?Read the answer and worked solution →Which statement about the mean of a sample is always true?Read the answer and worked solution →Adding one very large extreme value to a data set changes which measure the most?Read the answer and worked solution →Which mean suits the average speed over several equal-distance legs of a journey?Read the answer and worked solution →For which data set are the mean and the median always equal?Read the answer and worked solution →What does the plain arithmetic mean of 1 degree and 359 degrees give for these two angles?Read the answer and worked solution →Per capita income of a nation is best described as which of these?Read the answer and worked solution →What defines a weighted mean?Read the answer and worked solution →The simple arithmetic mean is a special case of a weighted average in which the weights are what?Read the answer and worked solution →In teaching, which three measures are sometimes called 'the three Ms' of average?Read the answer and worked solution →For heavily skewed data such as personal incomes, which average is usually reported?Read the answer and worked solution →Two equal-sized groups have means 40 and 60. What is the mean of the two groups combined?Read the answer and worked solution →
Worked practice questions
The numbers 10, 15, x and 25 have an average of 17. Find x.
- 16
- 15
- 20
- 18
Show answer and solution
Correct answer: D. 18
The total must be 68 and the known numbers give 50, so x = 18.
25 students average 60 marks. Five of them average 70. What is the average of the other 20?
- 55
- 58.5
- 60
- 57.5
Show answer and solution
Correct answer: D. 57.5
The class total is 1500 and the five give 350, so the other 20 total 1150, a mean of 57.5.
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