Averages — Study Plan
SNAP · Quantitative Aptitude
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A structured approach to studying Averages for SNAP Quantitative Aptitude.
Study Plan for Averages
Day 1–2: Learn the Theory
Study the chapter thoroughly. Note down definitions, formulas, and key concepts.
Day 3: Practice Problems
Solve practice questions and previous year SNAP problems. There are 44 questions available for this chapter.
Day 4: Revise & Test
Revise key formulas and concepts without looking at notes. Take a practice quiz to test your understanding.
What to Focus On
- Three measures of central tendency: Mean, Median, and Mode
- Arithmetic Mean = Sum of numbers / Count of numbers
- Median is the middle value in an ordered dataset
- Three variants of the average formula
- Average = Sum/n (when sum and count are known)
- Sum = n × Average (when average and count are known)
- Simple average treats all numbers equally
- Weighted average considers the importance of each group
- Used when combining groups of different sizes
Common Mistakes to Avoid
When combining groups with different averages, you can simply take the average of the averages to get the combined average
If a new number is added to a group and the average increases, the new number must be greater than all existing numbers
In speed problems, average speed equals the average of individual speeds
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