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15. The following density function describes a random variable X. fx) (x81) if 0<x<9 and nx)-(18-x)/81 if 9<x-18. Draw a graph of the density function and then use it to find the probabilities below: a. i. Find the probability that X lies between 1 and 8. ii. Find the probability that X lies between 8 and 11. ii. Find the probability that X is less than 10. iv. Find the probability that X is greater than 7.
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15. The following density function describes a random variable X. fx) (x81) if 0<x<9 and nx)-(18-x)/81...
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