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In a large school,80% of the pupils like...

In a large school,80% of the pupils like mathematics.A visitor to the school asks each of 4 pupils,chosen at random,whether they like mathematics.(ii)Find the probability that the visitor obtains the answer yes from atleast 2 pupils:(a)when the number of pupils questioned remains at 4.(b)When the number of pupils questioned is increased to 8.

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In a large school,80% of the pupils like mathematics.A visitor to the school asks each of 4 pupils,chosen at random,whether they like mathematics.(i)Calculate the probabilities of obtaining an answer yes from 0,1,2,3,4 of the pupils.

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