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,

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?

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