model 5 find new average from error Practice Questions Answers Test with Solutions & More Shortcuts
average PRACTICE TEST [9 - EXERCISES]
model 1 basic average questions
model 2 average of consecutive numbers
model 3 twice, thrice, one third etc. of numbers
model 4 find nth average from 1st & last number
model 5 find new average from error
model 6 find average of excluded number
model 7 average on ages/weight
model 8 find monthly income
model 9 average on cricket/exam
Question : 41 [SSC CGL Tier-I 2015]
The average marks obtained by a student in 6 subjects is 88. On subsequent verification it was found that the marks obtained by him in a subject was wrongly copied as 86 instead of 68. The correct average of the marks obtained by him is
a) 85
b) 87
c) 86
d) 84
Answer »Answer: (a)
Correct sum of marks obtained by the student
= 88 × 6 – 86 + 68
= 528 – 86 + 68 = 510
∴ Correct average = $510/6$ = 85
Aliter : Using Rule 26,
The correct average will be = m +${\text"(a-b)"}/ \text"n"$.
Here, n = 6, m = 88
a = 68, b = 86
Correct mean = m + ${\text"(a - b)"}/\text"n"$
= 88 +${(68 - 86)}/6$
= 88 - $18/6$ = 85
Question : 42 [SSC CHSL 2010]
While finding the average of 10 given numbers, a student, by mistake, wrote 64 in place of a number 46 and got his correct average 50. The correct average of the given numbers is :
a) 48.3
b) 48.2
c) 49.3
d) 49.1
Answer »Answer: (b)
Difference of numbers = 64 – 46 = 18
Correct average = 50 – $18/10$ = 50 – 1.8 = 48.2
Aliter : Using Rule 26,
The correct average will be = m +${\text"(a-b)"}/ \text"n"$.
Here, n = 10, m = 50
a = 46, b = 64
Correct Average = m + ${\text"(a - b)"}/\text"n"$
= 50 + ${(46 – 64)}/10$
= 50 -$18/10$
= 50 – 1.8 = 48.2
IMPORTANT quantitative aptitude EXERCISES
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Basic Average Questions Practice Test, Shortcuts, Tricks, PDF »
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Top 99+ Average Aptitude: Twice, One Third of Numbers MCQ »
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New +99 Average Aptitude MCQ Find nth Average of Numbers »
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99+ Average Aptitude Find New Average from Error MCQ Test »
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Top 99+ Aptitude MCQ Test on Average With Excluded Number »
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Top 99+ Aptitude Average on Ages & Weights MCQ Test Quiz »
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Top 149+ Aptitude Average on Cricket & Exam MCQ Test Quiz »
model 5 find new average from error Shortcuts »
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Click to Start..average Shortcuts and Techniques with Examples
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model 1 basic average questions
Defination & Shortcuts … -
model 2 average of consecutive numbers
Defination & Shortcuts … -
model 3 twice, thrice, one third etc. of numbers
Defination & Shortcuts … -
model 4 find nth average from 1st & last number
Defination & Shortcuts … -
model 5 find new average from error
Defination & Shortcuts … -
model 6 find average of excluded number
Defination & Shortcuts … -
model 7 average on ages/weight
Defination & Shortcuts … -
model 8 find monthly income
Defination & Shortcuts … -
model 9 average on cricket/exam
Defination & Shortcuts …
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