Give me the solution of these questions

Q.4 If X has the probability density function f (x) = k if -4 x S +4,0 elsewherend C such that P(-C 0. in a lot of 100 cans how many will contain 50 gallons or more? What is the probability that a can will contain less than 49.5 gallons less than 49 gallons? Also find F(x)