Question: X is absolutely continuous random variable with pdf =0.2*e^(-x/5) when x>0, pdf=0 otherwise. Y is a simple random variable, Y=20000 when 0

X is absolutely continuous random variable with pdf =0.2*e^(-x/5) when x>0, pdf=0 otherwise. Y is a simple random variable, Y=20000 when 0<=x<=1, Y= 10000 when 14. What's the interval [u-k*standard eviation,u+k*standard deviation]in 75% confident by using Cauchy Schawz Inequality ?

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