A coin is tossed twice. The probability of getting at least one head is: MCQ with Answer and Explanation

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A coin is tossed twice. The probability of getting at least one head is:

A. 1/2

B. 3/4

C. 1/4

D. 1

Answer: Option B

Solution (By JKSSB Mock Tests)

All outcomes except TT (1/4). So 1 - 1/4 = 3/4.

This question belongs to: Accountancy and Statistics Statistics

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Question #1

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Which of the following is a disadvantage of the mailed questionnaire method for primary data collection?

A. Limited geographical coverage

B. Low response rate and potential non-response bias

C. High cost per respondent

D. Requires highly trained enumerators

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Correct Answer: Option B

Explanation:
Mailed questionnaires often suffer from low return rates, and respondents who reply may differ systematically from non-respondents, introducing bias that is difficult to assess or correct.

This question belongs to: Accountancy and Statistics Statistics

Question #2

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If P(A)=0.7, P(B)=0.6, and P(A∪B)=0.9, then P(A∩B) is:

A. 0.6

B. 0.42

C. 0.3

D. 0.4

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Correct Answer: Option D

Explanation:
P(A∩B) = P(A)+P(B)-P(A∪B) = 0.7+0.6-0.9 = 0.4.

This question belongs to: Accountancy and Statistics Statistics

Question #3

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Which of the following statements about tabulation is correct?

A. Tabulation is the process of grouping data into classes.

B. Tabulation eliminates the need for classification.

C. Tabulation is the first step of data collection.

D. Tabulation presents data in rows and columns for easy comparison.

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Correct Answer: Option D

Explanation:
Tabulation is the systematic arrangement of data in a table with rows and columns.

This question belongs to: Accountancy and Statistics Statistics

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