A group of 1000 people are surveyed and asked two questions; whether they own a computer and whether the!»r use a computer at their workplace. The results

A group of 1000 people are surveyed and asked two questions; whether they own a computer and whether the!»r use a computer at their workplace. The results
are presented here: .9 496 people own a computer and use a computer at work
a 150 people own a computer but do not use a computer at work
o 120 people do not own a computer but use a computer at work
a 234 people do not own a computer and do not use a computer at work Define the events A and B to be: c A: a randomly chosen person owns a computer
0 B: a randomly chosen person does not use a computer at work Jessie was studying this situation and went about calculating the probability of the union 0’”. and B. Jessie did this by counting up all of the different ways thatA
could occur, and then counting up all of the ways that 3 could occur. She then added these two numbers together and divided by 1000 to find PM or B). a) A contingencyr table for the survey’ is shown. The values have not been put into the table, but the cells have been marked (31,. C2, C3, (34. Use computer 0W" a computer
at work YES NO YES
N o In the method that Jessie uses to calculate P(A or B), the cell that is over-counted is cell: h) Calculate the probability of the union A or 3. Give your answer as a decimal to 2 decimal places. FLA or B} =

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