18. Customer arrivals for a chinese restaurant in Haymarket follow a poisson distribution, with an average of 4 customer per 10 minute interval. what is the probability that at most 1 customer arrived in a given 10 minute interval? provide the answer as a fraction to three decimal places.

17. A survey was conducted in 2016 by CPA australia to investigate the reaction to new audit standards that were issued by AUASB. The survey found that 60% of the auditors believed that the new standards had improved audit quaality. Suppose 20 auditors from Australia are selected at random. On Averaage, how many of themm feel that the new standaards have imrpoveds audit quality?