Regent Airways is one of the premium private airline companies in Bangladesh. In a recent survey it was found that the average hourly wages of Regent Airways maintenance crew members is Tk. 99, with a standard deviation of Tk. 20. Assume that the hourly wages of maintenance crew members follow a normal distribution. a. What is the probability that a randomly selected crew member earns more than Tk. 63 per hour? Answer in exact fraction, or rounded to at least 4 decimal places. b. What is the probability that a randomly selected crew member earns between Tk. 44 and Tk. 150 per hour? Answer in exact fraction, or rounded to at least 4 decimal places. c. Junior crew members are considered for promotion after their hourly wages cross a certain threshold. What should the threshold wage be if Regent Airways does not want to promote any more than 87.39% of junior crew members? Answer in exact fraction, or rounded to at least 2 decimal places. Taka

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