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Probability — Flashcards

ICSE · Class 7 · Mathematics

25 flashcards for Probability (ICSE Class 7 Mathematics) to test yourself on key terms and facts. Sample: "A coin is tossed 40 times and head is"

61 questions25 flashcards6 formulas & key relations5 concepts

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25 Flashcards·
Empirical probabilityTwo-set countingEvent from outcomes
Card 1Empirical probability

A coin is tossed 40 times and head is obtained 14 times. Find the probability of getting a head.

Answer

Step 1: Total number of trials = 40 Step 2: Number of times head happened = 14 Step 3: Use P(E) = Number of trials in which the event happened / Total number of trials Step 4: P(head) = 14/40 = 7/20 A…

Card 2Empirical probability

A coin is tossed 40 times and head is obtained 14 times. Find the probability of getting a tail.

Answer

Step 1: Total number of trials = 40 Step 2: Number of tails = 40 - 14 = 26 Step 3: Use P(E) = Number of favourable outcomes / Total number of outcomes Step 4: P(tail) = 26/40 = 13/20 Answer: 13/20…

Card 3Two-set counting

Out of 400 students, 165 like tea only and 120 like coffee only. The rest like both. Find the probability that a chosen student likes both.

Answer

Step 1: Total students = 400 Step 2: Tea only = 165, coffee only = 120 Step 3: Students who like both = 400 - 165 - 120 = 115 Step 4: Probability = 115/400 = 23/80 Answer: 23/80…

Card 4Empirical probability

A student is chosen from 400 students. In the tea-coffee survey, find the probability of tea only and coffee only.

Answer

Step 1: Tea only = 165 out of 400 Step 2: P(tea only) = 165/400 = 33/80 Step 3: Coffee only = 120 out of 400 Step 4: P(coffee only) = 120/400 = 3/10 Answer: Tea only = 33/80, coffee only = 3/10…

Card 5Empirical probability

A die is thrown 50 times. The number 1 appears 5 times. Find the probability of getting 1.

Answer

Step 1: Total throws = 50 Step 2: Number of times 1 appears = 5 Step 3: Probability = 5/50 = 1/10 Answer: 1/10…

Card 6Empirical probability

A die is thrown 50 times. The number 4 appears 9 times and the number 5 appears 8 times. Find the probabilities of 4 and 5.

Answer

Step 1: Total throws = 50 Step 2: P(4) = 9/50 Step 3: P(5) = 8/50 = 4/25 Answer: P(4) = 9/50 and P(5) = 4/25…

Card 7Event from outcomes

A die is thrown 20 times. The outcomes show 2, 4, and 6 a total of 9 times. Find the probability of getting an even number.

Answer

Step 1: Even numbers on a die are 2, 4, and 6 Step 2: Number of even outcomes = 9 Step 3: Total throws = 20 Step 4: Probability = 9/20 Answer: 9/20…

Card 8Event from outcomes

A die is thrown 20 times. Odd numbers appear 11 times. Find the probability of getting an odd number.

Answer

Step 1: Odd numbers on a die are 1, 3, and 5 Step 2: Number of odd outcomes = 11 Step 3: Total throws = 20 Step 4: Probability = 11/20 Answer: 11/20…

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Frequently Asked Questions

What are the important topics in Probability for ICSE Class 7 Mathematics?
Key topics in Probability include Basic Ideas of Probability, Empirical Probability, Solved Examples and Answer Patterns, Complementary Events. Study these first, then practise questions on each for Class 7 exams.
How many flashcards are available for Probability?
There are 25 flashcards for Probability covering key definitions, facts and ideas. A few sample cards are shown on this page.
How should I revise Probability for Class 7 exams?
Learn the core ideas first, then work through the 61 practice questions on Probability. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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