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Probability and statistics
5 NET Mathematics questions with answers and explanations.
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What is the mean of the numbers 2, 4, 6, 8, 10?
- 1 5
- 2 6
- 3 7
- 4 30
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Correct answer: 6
The sum is 30 and there are 5 numbers, so the mean is 6.
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What is the median of 3, 1, 4, 1, 5?
- 1 1
- 2 3
- 3 4
- 4 2.8
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Correct answer: 3
Arranged in order: 1, 1, 3, 4, 5. The middle value is 3.
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A bag has 3 red and 2 blue balls. Two balls are drawn without replacement. What is the probability that both are red?
- 1 3/10
- 2 9/25
- 3 3/5
- 4 1/5
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Events A and B cannot happen together. P(A) = 0.3 and P(B) = 0.4. What is P(A or B)?
- 1 0.12
- 2 0.7
- 3 0.1
- 4 0.58
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Correct answer: 0.7
For mutually exclusive events, P(A or B) = P(A) + P(B) = 0.7.
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A fair coin is tossed 3 times. What is the probability of exactly one head?
- 1 1/8
- 2 3/8
- 3 1/2
- 4 1/4
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Correct answer: 3/8
There are 3 ways to place the head among 8 equally likely outcomes, so the probability is 3/8.