- A12
- B7
- C9
- D8
Step-by-Step Solution
First arrange in order: 3, 4, 5, 7, 9, 12, 15. The middle (4th) value is 7. Taking the middle card without sorting gives 12, which is wrong.
Answer: B) 7
Ishaan picked seven number cards and laid them down in the order shown. What is the median of the numbers on the cards?
Class 7Data HandlingData Handling
Key idea: Median — the middle value
Step 1: arrange the data in **ascending order**. Step 2: find the middle.
- **Odd count**: the middle value is the median. Marks 3, 5, 7, 9, 11 → median = 7.
- **Even count**: average the two middle values. Marks 3, 5, 7, 9 → middle two are 5 and 7 → median = (5+7)/2 = 6.
Median ignores extreme values; it tells you the 'typical middle' regardless of outliers.
- **Odd count**: the middle value is the median. Marks 3, 5, 7, 9, 11 → median = 7.
- **Even count**: average the two middle values. Marks 3, 5, 7, 9 → middle two are 5 and 7 → median = (5+7)/2 = 6.
Median ignores extreme values; it tells you the 'typical middle' regardless of outliers.
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