In a frequency distribution, the class width is computed as: MCQ with Answer and Explanation

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In a frequency distribution, the class width is computed as:

A. Lower limit + upper limit

B. Midpoint × 2

C. Upper limit - lower limit (for exclusive classes)

D. Frequency / total

Answer: Option C

Solution (By JKSSB Mock Tests)

Class width = difference between boundaries for exclusive classes.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

Which method is NOT a technique for collecting primary data?

A. Mailed questionnaire method

B. Extraction from government census publications

C. Direct personal investigation

D. Telephonic interview

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Correct Answer: Option B

Explanation:
Extraction from government census publications is a source of secondary data, not a method for collecting primary data, which requires firsthand gathering by the investigator.

This question belongs to: Accountancy and Statistics Statistics

Question #2

If (AB)=0, then the association between A and B indicates:

A. Positive association

B. No conclusion

C. Complete independence

D. Complete disassociation (perfect negative)

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Correct Answer: Option D

Explanation:
(AB)=0 means the two attributes never occur together, indicating complete negative association (disassociation).

This question belongs to: Accountancy and Statistics Statistics

Question #3

The combined mean of two groups with n₁=20, mean₁=50 and n₂=30, mean₂=60 is:

A. 54

B. 55

C. 56

D. 57

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Correct Answer: Option C

Explanation:
Combined mean = (20×50 + 30×60) / (20+30) = (1000+1800)/50 = 2800/50 = 56.

This question belongs to: Accountancy and Statistics Statistics

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