Question: When a computer disk manufacturer tests a disk, it writes to the disk and then tests it using a certifier. The certifier counts the number

When a computer disk manufacturer tests a disk, it writes to the disk and then tests it using a certifier. The certifier counts the number of missing pulses or errors. The number of errors on a test area on a disk has a Poisson distribution with A = 0.2.
(a) What is the expected number of errors per test area?
(b) What percentage of test areas have two or fewer errors?

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