The probability of getting at least one head in two tosses of a fair coin is: MCQ with Answer and Explanation

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The probability of getting at least one head in two tosses of a fair coin is:

A. 1/2

B. 1/4

C. 1

D. 3/4

Answer: Option D

Solution (By JKSSB Mock Tests)

P(at least one head) = 1 - P(no heads) = 1 - P(TT) = 1 - 1/4 = 3/4. Alternatively, favorable outcomes: HH, HT, TH (3 out of 4), so 3/4.

This question belongs to: Accountancy and Statistics Statistics

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Practice More Statistics Questions

Question #1

An ogive is a graph of:

A. Frequency against lower limits

B. Frequency vs class midpoints

C. Cumulative frequency against lower class boundaries

D. Cumulative frequency against upper class boundaries

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Correct Answer: Option D

Explanation:
A 'less than' ogive plots cumulative frequency against the upper class boundaries.

This question belongs to: Accountancy and Statistics Statistics

Question #2

In a binomial distribution with n=4 and p=1/2, the probability of exactly 2 successes is:

A. 3/8

B. 1/2

C. 1/4

D. 1/16

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Correct Answer: Option A

Explanation:
C(4,2)×(1/2)^2×(1/2)^2 = 6×1/4×1/4=6/16=3/8.

This question belongs to: Accountancy and Statistics Statistics

Question #3

Neonatal mortality rate is expressed per:

A. 1000 women

B. 1000 population

C. 1000 live births

D. 1000 total births

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Correct Answer: Option C

Explanation:
NMR = (Neonatal deaths / Live births) × 1000.

This question belongs to: Accountancy and Statistics Statistics

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