Exam-Style Problem

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Nov 2011 p63 q6
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Human blood groups are identified by two parts. The first part is A, B, AB or O and the second part (the Rhesus part) is + or −. In the UK, 35% of the population are group A+, 8% are B+, 3% are AB+, 37% are O+, 7% are A−, 2% are B−, 1% are AB− and 7% are O−.

A random sample of 150 people in the UK is taken. Find the probability that more than 60 people are group A+.

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