# Question

An experienced order taker at the L.L. Bean call center has a .003 chance of error on each keystroke (i.e., 5 .003). In 500 keystrokes, find the approximate probability of

(a) At least two errors and

(b) Fewer than four errors.

(c) Is the Poisson approximation justified?

(a) At least two errors and

(b) Fewer than four errors.

(c) Is the Poisson approximation justified?

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