Probability
ICSE · Class 10 · Mathematics
Most important questions from Probability for ICSE Class 10 Mathematics board exam 2026. MCQs, short answer, and long answer questions with marks.
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A bag contains 3 red balls and 2 blue balls. What is the probability of drawing a red ball?
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3/5
Total balls = 3 + 2 = 5. Red balls = 3. P(red ball) = 3/5 = 0.6
Which of the following are properties of probability? (Select all correct answers)
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Probability is always between 0 and 1, Sum of probabilities of all outcomes in sample space is 1, Probability of impossible event is 0, Probability of sure event is 1
Basic properties: 0 ≤ P(E) ≤ 1, P(impossible event) = 0, P(sure event) = 1, and sum of all probabilities = 1. Probability cannot be negative.
A die is rolled. What is the probability of getting a number greater than 4?
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1/3
Numbers greater than 4: {5, 6}. Favorable outcomes = 2. Total outcomes = 6. P(number > 4) = 2/6 = 1/3
Three coins are tossed. What is the probability of getting all heads?
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1/8
Sample space has 2³ = 8 outcomes. All heads = {HHH} = 1 outcome. P(all heads) = 1/8
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