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Further Mathematics Paper 2, May/June. 2008  
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Questions: 1 2 3 4 5 6 7 8 9 1011121314 15 16 17 18 Main
General Comments
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Question 13

A survey indicated that 65% of the families in an an~a have cars. Find, correct to three decimal places, the probability that among 7 families selected at random in the area.
            (a)        exactly 5;
            (b)           3 or 4;
            (c)        at most 2 of them have cars.

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Observation

Through a few candidates attempted this question, the few who did performed well. They were able to substitute the values of p(.65) and q(.35) into the binomial expansion and obtained correct answers.

 

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