Events on a probability scale

Events on a probability scale

Secondary 2
3 marks
TGM Original Questions

A bag contains 30 balls: 12 orange, 11 purple and 7 green. Define event \(A\): green; \(B\): orange or purple; \(C\): not orange; \(D\): purple. One ball is selected at random.

  1. Find \(P(A),P(B),P(C),P(D)\).[2]
  2. Mark A, B, C and D on the probability scale.[1]

Solution:

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Answer:\(P(A)=\frac{7}{30}, P(B)=\frac{23}{30}, P(C)=\frac{3}{5}, P(D)=\frac{11}{30}\); order A, D, C, B.

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