Probability: how many fume cupboards should be available?

Chris707

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This is beyond my understanding anybody else get It?

In a certain survey of the work of chemical research workers, it was found, on the basis of extensive data, that on average each man required no fume cupboard for 60 per cent of his time, one cupboard for 30 per cent and two cupboards for 10 per cent; three or more were never required. If a group of four chemists worked independently of one another, how many fume cupboards should be available in order to provide adequate facilities for at least 95 per cent of the time?

is this a P(A or B)
or P(A and B) ?
 
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This is beyond my understanding anybody else get It?

In a certain survey of the work of chemical research workers, it was found, on the basis of extensive data, that on average each man required no fume cupboard for 60 per cent of his time, one cupboard for 30 per cent and two cupboards for 10 per cent; three or more were never required. If a group of four chemists worked independently of one another, how many fume cupboards should be available in order to provide adequate facilities for at least 95 per cent of the time?

We understand the problem.

What is the context of your query - Is it a homework or is it a project problem? What type of statistics courses have you taken or currently taking?
 
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