Question-5 The PH level for water samples from the lake is a random variable with probability density function S(x) = { ² (7- x)² 5 ≤x≤7 f I. find the probability that the PH level measurements will be at most 6.8; II. what is level of PH that the measurements will be exceeded with 82% of the pH measurements. b. A machinist produces 22 items during a shift. Three of the 22 items are defective and the rest are non-defective. In how many different orders can the 22 items be arranged.

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