Cabs pass your workplace according to a Poisson process with a mean of four cabs per hour. Suppose that you exit the workplace at 6:00 p.m. Determine the mean number of cabs per hour so that the probability that you wait more than 10 minutes is 0.5. O a.4.1589 O b.6.9315 O. 2.7726 O d. NONE

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