Need help with parts A-C, dont know if I am inputting the answers wrong or just not using the right equation but stuck on this problem

Once an individual has been infected with a certain disease, letX represent the time (days) that elapses before the individual becomes infectious. An article proposes a Weibull distribution with a = 2.2, L? = 1.4, and y = 0.5. [Hint: The two-parameter Weibull distribution can be generalized by introducing a third parameter y, called a threshold or location parameter: replace x in the equation below, LXa 150413)\" X a 0 f(x; 61,1?) = Ba 0 X 1.5). (Round your answer to four decimal places.) 7" (c) What is the 90th percentile of the distribution? (Round your answer to three decimal places.) 2.5 X days (d) What are the mean and standard deviation ofX? (Round your answers to three decimal places.) mean days standard deviation days