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A study was recently done to investigate the relationship between drinking alcohol and number of vehicles involved in accidents. Four hundred accidents that occurred on a Saturday night were analysed. The numbers are shown below:
(i) What is the probability that a randomly selected accident involved 1 vehicle with the effect of alcohol? Write down the calculations needed to find the answers (You do NOT need to work it out).
(ii) What is the probability that a randomly selected accident involved 1 vehicle OR with the effect of alcohol?
(iii) If the selected accident is found to be involved with effect of alcohol, what is the probability that it is 1 vehicle? Write down the calculations needed to find the answers (You do NOT need to work them out.)
(iv) If the selected accident is found to be involved with 1 vehicle, what is the probability that it is involved with effect of alcohol? Write down the calculations needed to find the answers: (You do NOT need to work them out.)
(v) Are the events "the selected accident is involved with 1 vehicle" and "the selected accident is involved with effect of alcohol" independent? No/Yes? (1 mark) Explain your reasoning.
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