# Question: When a computer disk manufacturer tests a disk

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?

(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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