model 6 find average of excluded number Section-Wise Topic Notes With Detailed Explanation And Example Questions
MOST IMPORTANT quantitative aptitude - 9 EXERCISES
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Basic Average Questions Practice Test, Shortcuts, Tricks, PDF »
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New Average Aptitude MCQ Average of Consecutive Numbers »
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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 Aptitude Average MCQ Find Monthly Income for Average »
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Top 149+ Aptitude Average on Cricket & Exam MCQ Test Quiz »
The following question based on average topic of quantitative aptitude
(a) 10.5
(b) 11
(c) 9
(d) 11.5
The correct answers to the above question in:
Answer: (b)
Sum of three new numbers = 8 × 8.5 – 7 × 5
= 68 – 35 = 33
∴ Required average = $33/3$ = 11
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Read more excluded numbers Based Quantitative Aptitude Questions and Answers
Question : 1
If the mean of 4 observations is 20, when a constant 'C’ is added to each observation, the mean becomes 22. The value of C is :
a) –2
b) 2
c) 6
d) 4
Answer »Answer: (b)
4C = 22 × 4 – 20 × 4 = 88 – 80 = 8
⇒ C = $8/4$ = 2
Question : 2
The average weight of 12 parcels is 1.8 kg. Addition of another new parcel reduces the average weight by 50 g. What is the weight of the new parcel ?
a) 1.10 kg
b) 1.15 kg
c) 1.50 kg
d) 1.01 kg
Answer »Answer: (b)
Total weight 12 parcels = 12 × 1.8 = 21.6 kg.
New average of 13 parcels = 1.8 – 0.05 = 1.75 kg.
Total weight of 13 parcels = 13 × 1.75 = 22.75 kg.
∴ Weight of new parcel = 22.75 – 21.6 = 1.15 kg.
Aliter : Using Rule 18,
( If in the group of N persons, a new person comes at the place of a person of 'T’ years, so that average age,
increases by 't’ years
Then, the age of the new person = T + N.t. )
Here, T = 1.8, N= (12 + 1) = 13, t = $50/1000$ = .05
Weight of new parcel = T – Nt
= 1.8 – 13 × 0.05
= 1.8 – 0.65 = 1.15 kg
Question : 3
The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is :
a) 27
b) 30
c) 25
d) 35
Answer »Answer: (d)
Total sum of five numbers = 27 × 5 = 135
Total sum of four numbers = 25 × 4 = 100
∴ Required number = 135 – 100 = 35
Question : 4
The average of six numbers is 32. If each of the first three numbers is increased by 2 and each of the remaining three numbers is decreased by 4, then the new average is
a) 34
b) 31
c) 35
d) 30
Answer »Answer: (b)
Change = 2×3 – 3 × 4 = – 6
∴ New average = 32 -$6/6$ = 31
Question : 5
The average of marks of 28 students in Mathematics was 50; 8 students left the school, then this average increased by 5. What is the average of marks obtained by the students who left the school ?
a) 37.5
b) 42.5
c) 50.5
d) 45
Answer »Answer: (a)
Total marks of 28 students = 28× 50 = 1400
Total marks of 20 students = 20 × 55 = 1100
∴Total marks of 8 students = 1400 – 1100 = 300
∴ Average = $300/8$ = 37.5
Question : 6
The average of five numbers is 140. If one number is excluded, the average of the remaining four numbers is 130. The excluded number is :
a) 134
b) 180
c) 135
d) 150
Answer »Answer: (b)
Required number = 5 × 140 – 4 × 130
= 700 – 520 = 180
Aliter : Using Rule 25,
Here, x = (140 – 130) = 10, n = 5
Excluded number = Average + x (n – 1)
= 140 + 10 × 4 = 180
GET average PRACTICE TEST 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
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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