Weighted mean of values 10, 20, 30 with weights 3, 2, 1 respectively is: MCQ with Answer and Explanation

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Weighted mean of values 10, 20, 30 with weights 3, 2, 1 respectively is:

A. 20

B. 15

C. 18.33

D. 16.67

Answer: Option D

Solution (By JKSSB Mock Tests)

Weighted sum = 3×10+2×20+1×30 = 100. Sum of weights = 6. Mean = 100/6 = 16.67.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

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An index number measures changes in a variable relative to a:

A. Future value

B. Average value

C. Current value

D. Base period value

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Correct Answer: Option D

Explanation:
Index numbers compare the current level to the base period level, usually expressed as percentage.

This question belongs to: Accountancy and Statistics Statistics

Question #2

Which source is MOST appropriate for obtaining secondary data on national employment trends?

A. Interviewing employment exchange officials

B. Using data from the Periodic Labour Force Survey (PLFS) reports

C. Distributing questionnaires to job seekers

D. Conducting a new household survey

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Correct Answer: Option B

Explanation:
The Periodic Labour Force Survey (PLFS) is an official government publication providing comprehensive employment data, making it a reliable source of secondary data for national trends.

This question belongs to: Accountancy and Statistics Statistics

Question #3

In a class, 60% students pass in English and 70% in Mathematics. 20% fail in both. The percentage that pass in at least one subject is:

A. 80%

B. 90%

C. 60%

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Correct Answer: Option A

Explanation:
Pass in at least one = 100% - fail in both = 100% - 20% = 80%.

This question belongs to: Accountancy and Statistics Statistics

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