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+ By the end of 2021. the percentage. it\". of the population [expressed in decimals} that will be vaccinated is given by the density function fix) = [kfz o a: X 1:: 1. elsewhere. a. Find it. in. Find the cdf Hit) and use it to evaluate the probability that 3096 to 60% will be vaccinated at the end of the year. i The number of months that a certain heavy equipment can be used before it fails beyond repair is a randorn variable having the density function Et] :- a fix} = {x + ltlll}3' " ' ll. elsewhere. Determine the probability that a heavy equipment will last for a. At least 15 years. b. Anywhere from 5 to it] years. What is a probability mass function plot? How is it different from a probability histogram? i What is the difference between a probability mass function and a probability density function