Ray's answer to Elle's Junior College 2 H2 Maths Singapore question.
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For stats, need to remember the formula.
First part is conditional probability formula.
(i) answer is basically the numerator of first part.
(ii) just find P(M) and remember to include the dices in your calculation for P(M) as only when rolled the dice could you take from white or black bag!
P(W∩M) = P(M∩W), so just use (i) divide by P(M).
(iii) use formula for non-mutual events.
(iv) all together will have 20 items in a bag. Rmb to "x4!" as you can get either of the 4 different items first.
Hope this helps!
First part is conditional probability formula.
(i) answer is basically the numerator of first part.
(ii) just find P(M) and remember to include the dices in your calculation for P(M) as only when rolled the dice could you take from white or black bag!
P(W∩M) = P(M∩W), so just use (i) divide by P(M).
(iii) use formula for non-mutual events.
(iv) all together will have 20 items in a bag. Rmb to "x4!" as you can get either of the 4 different items first.
Hope this helps!
Date Posted:
3 years ago
thank u !
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