Waiting Time At a certain supermarket, the amount of wait time at the express lane is a random variable with density function f(x) = 11/[10(x + 1)*], 0 < x s 10. (See Fig. 8.) Find the probability of having to wait less than 4 minutes at the express lane. 1.1 11 S(x) 10(x + 1)? 10 Figure 8 A density function.

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