A number x is selected at random from the interval [4,20]. The probability density function for x is given by the following function. Find the probability that a numbe selected is in the subinterval [9,18]. 1 for 4sxs 20. 16' f(x) = ..... How is the probability that a number selected is in the subinterval [9,18] calculated? 1 over the limits 9 and 18, then subtract. 16 O A. Evaluate O B. Integrate twice, then evaluate the integral over the limits 9 and 18. 16 1 over the limits 9 and 18, then add. 16 O C. Evaluate 1 O D. Integrate then evaluate the integral over the limits 9 and 18. 16 The probability is

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