LAJ 0/4 Points] DETAILS PREVIOUS ANSWERS DEVORESTAT9 4.E.074. ASK YOUR TEACHER PRACTICE ANOT Once an individual has been infected with a certain disease, let X represent the time (days) that elapses before the individual becomes infectious. An article proposes a Weibull distribution with a = 2.3, B = 1.6, 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, f( x; a, B ) = Bah - le - ( x / B ) a x 20 0 x 1.5). (Round your answer to four decimal places.) 0.5555 X (c) What is the 90th percentile of the distribution? (Round your answer to three decimal places.) 2.107 X days (d) What are the mean and standard deviation of X? (Round your answers to three decimal places.) mean 0.227 x days standard deviation 0.805 x days Need Help? Read It Talk to a Tutor3. [1.71/4 Points] DETAILS PREVIOUS ANSWERS DEVORESTAT9 3.E.048. ASK YOUR TEACHER PRACTICE ANOTH NBC News reported on May 2, 2013, that 1 in 20 children in the United States have a food allergy of some sort. Consider selecting a random sample of 15 children and let X be the number in the sample who have a food allergy. Then X ~ Bin(15, 0.05). (Round your probabilities to three decimal places.) (a) Determine both P(X s 2) and P(X