- A2/3
- B1/3
- C1/2
- D5/6
Step-by-Step Solution
Blue faces: 3, 5. Numbers greater than 4: 5, 6. Together the faces are 3, 5, 6 (count 5 only once). .
Answer: C) 1/2
Priya paints the faces of a cube as shown in its net, and writes a number on each face. She rolls it once. What is the probability that the top face is blue OR shows a number greater than 4?
Class 7Data HandlingData Handling
Key idea: Probability — chance as a number
If all outcomes are equally likely, the probability of an event is:
P(event) = (number of outcomes favouring the event) / (total possible outcomes).
Examples on a fair die:
- P(rolling a 4) = .
- P(rolling an even number) = (favourable: 2, 4, 6).
- P(rolling a number > 6) = (impossible).
- P(rolling a number ≤ 6) = (certain).
Probability is always between 0 (impossible) and 1 (certain). The probabilities of all possible outcomes sum to 1.
P(event) = (number of outcomes favouring the event) / (total possible outcomes).
Examples on a fair die:
- P(rolling a 4) = .
- P(rolling an even number) = (favourable: 2, 4, 6).
- P(rolling a number > 6) = (impossible).
- P(rolling a number ≤ 6) = (certain).
Probability is always between 0 (impossible) and 1 (certain). The probabilities of all possible outcomes sum to 1.
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