The complement of the event 'at least one head' in two coin tosses is: MCQ with Answer and Explanation

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The complement of the event 'at least one head' in two coin tosses is:

A. Exactly one head

B. Two heads

C. No heads (both tails)

D. At least one tail

Answer: Option C

Solution (By JKSSB Mock Tests)

Complement of 'at least one head' is 'no heads'.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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If a population has a high proportion of young people, the crude death rate may be low even if age-specific rates are high. This is an example of:

A. Direct standardization

B. Age structure effect

C. Sampling error

D. Reverse causality

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Correct Answer: Option B

Explanation:
A young population has fewer old people where mortality is high, thus CDR can be low.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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Which of the following is a component of HDI (Human Development Index)?

A. Crude Death Rate

B. Net Reproduction Rate

C. Life expectancy at birth

D. Gross Reproduction Rate

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Correct Answer: Option C

Explanation:
HDI includes life expectancy, education, and income.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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The mode can be found graphically by:

A. Bar diagram

B. Histogram

C. Ogive

D. Pie chart

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Correct Answer: Option B

Explanation:
The modal class is the tallest bar in a histogram.

This question belongs to: Accountancy and Statistics Statistics

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