(a)[1]
Use Basia’s results to estimate the probability that the next car observed is blue.
(b)[1]
During the next hour, $500$ cars pass the school gate. Use Basia’s results to estimate how many of those cars are red.
(c)[1]
Colin records the colours of the next $100$ cars passing the school gate. His results are given in the table below. Use Basia’s and Colin’s combined results to estimate how many red cars would be seen if $500$ cars pass the school gate.
(d)[1]
Which estimate in part (b) or part (c) do you think is likely to be the better one? Give a reason for your choice.