- A20.5
- B19.5
- C20
- D19
Step-by-Step Solution
The gap between 19 and 20 is split equally, so each limit moves by 0.5: the class 20–29 becomes 19.5–29.5.
Answer: B) 19.5
The marks in a quiz are grouped in inclusive classes 0–9, 10–19, 20–29 and so on. What is the true lower boundary of the class 20–29?
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