1. Selene’s immediate superior notices that she tends to commit an average of 15 errors for every 50 pages of her report

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1. Selene’s immediate superior notices that she tends to
commit an average of 15 errors for every 50 pages of her report. If
20 pages are selected at random and Poisson distribution applies,
what is the probability that:
a. more than 6 errors are found?
b. a maximum of 11 errors is found?
c. at most 8 errors are found?