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. No heads (both tails)

B. Two heads

C. Exactly one head

D. At least one tail

Answer: Option A

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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Practice More Statistics Questions

Question #1

Given N=100, (A)=40, (B)=30. The expected frequency of (AB) under independence is:

A. 30

B. 40

C. 12

D. 20

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Correct Answer: Option C

Explanation:
Expected (AB) = (A)×(B)/N = 40×30/100 = 12.

This question belongs to: Accountancy and Statistics Statistics

Question #2

A car travels 60 km/h for the first half of a distance and 40 km/h for the second half. The average speed (km/h) is:

A. 48

B. 52

C. 50

D. 45

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Correct Answer: Option A

Explanation:
Harmonic mean of speeds: 2 / (1/60 + 1/40) = 2 / (5/120) = 240/5 = 48 km/h.

This question belongs to: Accountancy and Statistics Statistics

Question #3

The value that appears maximum number of times in a data set is called:

A. Mode

B. Median

C. Mean

D. Range

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Correct Answer: Option A

Explanation:
Mode is the most frequent value.

This question belongs to: Accountancy and Statistics Statistics

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