Averages in Aptitude MCQ Quiz (Multiple Choice Questions And Answers)
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76. The mean of 50 observations was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is:
- 35
- 36.5
- 32
- 36
77. A pupil's marks were wrongly entered as 83 instead of 63. Due to the average marks for the class got increased by half. The number of pupils in the class is:
- 20
- 40
- 10
- 25
78. The average age of 15 students of a class is 15 years. Out of these, the average age of 5 students is 14 years and that of the other 9 students is 16 years. Tee age of the 15th student is:
- 22 years
- 11 years.
- 33 years
- 44 years
79. The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is:
- 32 kg
- 31 kg.
- 33 kg
- 34 kg