Question 4 4 Marks (a) In a study conducted by a bus transportation company, the average time of bus arrival at the central station is memally didebuted with a mean of 78 minutes and a standard deviation of 8 minutes. What value does the upper 5% of the tie exceed? 1 mark The Bureau of Meteorology found that the air temperature varies uniformly between 12 degree Cabins and 25 degree Celsius. What is the probability that the ar temperature will be less than 21 degree Celsius? 1 mark (: A marketing company is combating in experiment in which participants are to taste one of two different brands of coffee. Their task is to corectly identify the brand tasted Arandon sample of 200 participants is taken and 1 is assumed that the participants have no ability to distinguish between the two brank. (i) What is the probability that the sample percentage of correct identification is greater than 65? 1 mark [ii) What is the probability that the sample will have between 50% and 60% of the identifications correct? 1 mark