1. The water supply in a school depends entirely on two water pumps, K and L. The
probability of pump K failing is 0.12 and the probability of pump L failing is 0.18.
(a) Draw a tree diagram, to represent the information.
(b) From the diagram, find the probability that;
i) Both pumps are working
ii) There is no water in school
(2marks)
(2marks)
(2marks)
iii) Only one pump is working
(2marks)
iv) There is some water in school
(2marks)
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