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 Form 4 Exam Standard Mathematics Paper 2 Questions and Answers

In a research experiment a new drug for a deadly livestock disease was being tried. A sample of cows which were found to have the disease was used in the experiment. In this sample 54 cows were treated with the drug and the remaining 18 cows were not treated.
a).Calculate the probability that a cow picked at random from the sample is
i).treated with the drug.
ii).not treated with the drug.
b).The probability that a cow treated with the drug will die is #1/10# and the probability that a cow which is not treated with the drug will die is #4/5# .Use a tree diagram to calculate the probability that a cow picked at
random from the sample is
i).treated with the drug and will die.
ii).not treated with the drug and will die
iii).treated with the drug and will not die.
iv).not treated with the drug and will not die.

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