- A38.75
- B50
- C35
- D37.625
Step-by-Step Solution
Class marks 5, 20, 45, 80. ; mean . (Unequal widths do not change the method for the mean.)
Answer: D) 37.625
Classes 0–10, 10–30, 30–60 and 60–100 (unequal widths) have frequencies 5, 15, 12 and 8. What is the mean?
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