In a continuous frequency distribution, the class interval '10-20' means the class includes: MCQ with Answer and Explanation

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In a continuous frequency distribution, the class interval '10-20' means the class includes:

A. Values greater than 20

B. Values from 10 up to exactly 20

C. Values from 10 up to but not including 20 (in an exclusive series)

D. Only the values 10 and 20

Answer: Option C

Solution (By JKSSB Mock Tests)

In standard exclusive class intervals, the lower limit is included, but the upper limit is excluded and falls into the next class.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

Neonatal mortality refers to deaths during the first:

A. 24 hours

B. 7 days

C. 1 year

D. 28 days

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Correct Answer: Option D

Explanation:
Neonatal period is the first 28 days of life.

This question belongs to: Accountancy and Statistics Statistics

Question #2

If P(A) = 0.3, P(B) = 0.4, and A, B are mutually exclusive, then P(A∪B) is:

A. 0.1

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D. 0.7

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Correct Answer: Option D

Explanation:
Mutually exclusive → P(A∪B) = P(A) + P(B) = 0.3+0.4=0.7.

This question belongs to: Accountancy and Statistics Statistics

Question #3

A box contains 4 white and 2 black balls. Two balls are drawn successively with replacement. Probability both are white is:

A. 4/9

B. 2/3

C. 5/9

D. 1/9

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Correct Answer: Option A

Explanation:
With replacement: P(WW) = (4/6)×(4/6) = 16/36 = 4/9.

This question belongs to: Accountancy and Statistics Statistics

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