4. The probability density function of ( X ), the lifetime of a certain type of electronic device (measured in hours) is given by [ f(x)=left{egin{array}{ll} frac{10}{x^{2}} & ext { for } x>10 \ 0 & ext { for } x leq 10 end{array} ight. ] (a) Find ( P(X>20) ). (b) What is the cumulative distribution of ( X ).
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