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Probability

Probability

IP 4

A spinner has two possible scores: \[P(1)=\frac14,\qquad P(2)=\frac34.\] It is spun twice independently.

  1. List the four ordered score pairs.

  2. Find the probability that the total score is \(3\).

  3. Explain why counting two favourable cells out of four gives an incorrect answer.

Solution:

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Answer:(a) \((1,1),\ (1,2),\ (2,1),\ (2,2)\). (b) \(\frac38\). (c) The four cells are not equally likely.

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