If P(A)=0.2 and P(B)=0.5, and A, B are independent, then P(A∩B) is: MCQ with Answer and Explanation

If P(A)=0.2 and P(B)=0.5, and A, B are independent, then P(A∩B) is:

A. 0.6

B. 0.3

C. 0.1

D. 0.7

Answer: Option C

0.2×0.5 = 0.1.

This question belongs to: Accountancy and Statistics Statistics

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Question #1 Report Error

If A and B are independent events with P(A)=0.5, P(B)=0.4, P(A∪B) is:

A. 0.2

B. 0.9

C. 0.5

D. 0.7

Correct Answer: Option D

Explanation:
P(A∪B) = 0.5 + 0.4 - (0.5×0.4) = 0.9 - 0.2 = 0.7.

This question belongs to: Accountancy and Statistics Statistics

Question #2 Report Error

If the infant mortality rate is high, life expectancy at birth is likely to be:

A. High

B. Equal to IMR

C. Low

D. Unchanged

Correct Answer: Option C

Explanation:
High infant deaths reduce average life expectancy.

This question belongs to: Accountancy and Statistics Statistics

Question #3 Report Error

A person travels from A to B at 40 km/h and returns from B to A at 60 km/h. His average speed for the whole journey is:

A. 50 km/h

B. 48 km/h

C. 52 km/h

D. 45 km/h

Correct Answer: Option B

Explanation:
For equal distances, use Harmonic Mean: 2ab/(a+b) = 2(40)(60)/(100) = 4800/100 = 48 km/h.

This question belongs to: Accountancy and Statistics Statistics