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: MCQ with Answer and Explanation

Question

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. 50%

C. 60%

D. 90%

Answer: Option A

Solution (By JKSSB Mock Tests)

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

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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The property that the sum of squared deviations from the measure is minimum is characteristic of:

A. Geometric mean

B. Arithmetic mean

C. Median

D. Mode

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Correct Answer: Option B

Explanation:
The arithmetic mean minimizes the sum of squared deviations, i.e., Σ(x - x̄)² is minimum.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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The class midpoint is also known as:

A. Class interval

B. Class limit

C. Class frequency

D. Class mark

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Correct Answer: Option D

Explanation:
Class mark = (lower limit + upper limit)/2.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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A set of 9 numbers has mean 12. If a number 15 is removed, the new mean is:

A. 11.5

B. 13.0

C. 12.0

D. 11.625

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Correct Answer: Option D

Explanation:
Sum initially = 9 × 12 = 108. After removing 15, sum = 93, n = 8. New mean = 93/8 = 11.625.

This question belongs to: Accountancy and Statistics Statistics

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