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) 2 , 0 x 10 (See Fig 8 ) Find the probability of having to wait less than 4 minutes at the express lane 1 1 y 11 10(x 1) 0 10 Figure 8 A density function X

Question: 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 +

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)²], 0 ≤ x ≤ 10. (See Fig. 8.) Find the probability of having to wait less than 4 minutes at the express lane. 1.1 y 11 10(x + 1) 0 10 Figure 8 A density

1.1 y 11 10(x + 1) 0 10 Figure 8 A density function. X

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