Average – Verified PYQ Authority Guide
Average is a sub-topic revision hub built around verified PYQ evidence. It connects the recurring question patterns inside this sub-topic with the formulas, exam tips, common traps and concept pages already present in SRO. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.
PYQ evidence snapshot
9 verified PYQs are currently mapped to this Sub Topic hub. The represented years include 2025. Exam coverage currently includes RRB NTPC Under Graduate Level. Subject context includes Quantitative Aptitude. These values come from live mappings and can expand automatically when new verified PYQs are added.
Most useful verified PYQs to solve first
Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.
- If the arithmetic mean of five numbers is 20 and one number is changed from 10 to 20, what happens to the mean?
RRB NTPC Under Graduate Level · 2025 · Arithmetic Mean
Use the standard Arithmetic Mean method and simplify; the result matches It increases by 2. - If the mean of the following data is 40, find the missing frequency. x 10 20 30 40 50 60 frequency 2 3 1 4 f 4
RRB NTPC Under Graduate Level · 2025 · Arithmetic Mean
Use the standard Arithmetic Mean method and simplify; the result matches 5. - The arithmetic mean of 3, 7, 11,..., 51 is ______.
RRB NTPC Under Graduate Level · 2025 · Arithmetic Mean
Use the standard Arithmetic Mean method and simplify; the result matches 27. - Find the mean of the following data. Class interval 0-8 8-16 16-24 24- 32 32-40 40-48 Frequency 4 6 7 3 12 8
RRB NTPC Under Graduate Level · 2025 · Arithmetic Mean
Use the standard Arithmetic Mean method and simplify; the result matches 27.4. - Five friends participated in a cooking contest and scored 6, 8, 7, 9, and 5 out of 10, respectively. What is the arithmetic mean of their scores?
RRB NTPC Under Graduate Level · 2025 · Arithmetic Mean
Use the standard Arithmetic Mean method and simplify; the result matches 7. - The arithmetic mean of 25 observations is 32.6. If the arithmetic mean of the first 24 observations is 30, what is the 25th observation?
RRB NTPC Under Graduate Level · 2025 · Arithmetic Mean
Use the standard Arithmetic Mean method and simplify; the result matches 95. - The mean of the following data is 12.5. Find the missing frequency p. Data Values (x): 10, 15 Frequency (f): 5, p
RRB NTPC Under Graduate Level · 2025 · Arithmetic Mean
Use the standard Arithmetic Mean method and simplify; the result matches 5. - What is the arithmetic mean of the dataset {12, 25, 37, 48, 56, 61, 73, 85, 92, 104}?
RRB NTPC Under Graduate Level · 2025 · Arithmetic Mean
Use the standard Arithmetic Mean method and simplify; the result matches 59.3.
Formula & key-relationship bank from verified solutions
Average = Sum of observations / Number of observations
Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.
Core ideas repeatedly reinforced by the solved corpus
- Use the standard Arithmetic Mean method and simplify; the result matches It increases by 2.
- Use the standard Arithmetic Mean method and simplify; the result matches 5.
- Use the standard Arithmetic Mean method and simplify; the result matches 27.
- Use the standard Arithmetic Mean method and simplify; the result matches 27.4.
- Use the standard Arithmetic Mean method and simplify; the result matches 7.
Exam tips already validated in SRO solutions
- Identify the Arithmetic Mean relationship before calculation and keep units/bases consistent.
Common mistakes to avoid
- Using a shortcut without checking its conditions or using the wrong base/unit.
Topic and concept coverage
Mapped topic labels include Average. The concept trail includes Arithmetic Mean. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.
Knowledge Graph navigation
Continue with Average, Arithmetic Mean, Arithmetic, Quantitative Aptitude. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.
How to revise this authority page efficiently
- Solve before reading: answer a mapped PYQ first.
- Read the exact explanation: verify the correct principle, formula, distractor logic and common mistake on that question page.
- Move one level in the graph: use the closest concept/sub-topic/topic link rather than opening unrelated content.
- Reattempt: solve another verified PYQ from this hub and check whether the same error repeats.
Quality scope: this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.