alleryThe average of 6 numbers is 8. If the number 12 is removed, the average of the remaining 5 is:
A7
B7.5
C7.2
D8
Answer & Solution
Correct answer: C. 7.2
1. Find the total of all six: 8 x 6 = 48.
2. Removing 12 leaves a total of 48 - 12 = 36.
3. Five numbers remain.
4. So the new average is 36 / 5 = 7.2.
5. The average falls because the removed number, 12, was above the old average of 8.
_Source: syllabus Maths, Ch 13 'Statistics', S13.2 Mean of Grouped Data_
Keep practising Averages
Browse all Averages questions for AFCAT, or explore more Quantitative Aptitude topics.
Related questions
A batsman's average over 16 innings is 36. To raise the average to 38 in the 17th innings,The average of 15 numbers is 12. The first 8 average 11 and the last 8 average 14. The 8thIn a branch, 30 clerks average 60 marks and 20 officers average 70. The average of all 50 The class mark of the class interval 10-25 is:The average of 10 numbers is 45. A new number, 100, is added to the set. The new average iThe average of the first 10 natural numbers is:The three measures of central tendency are:The mean of a set of observations is found by: