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Deficiency by examining a specimen of bl...

Deficiency by examining a specimen of blood under microscope. Suppose a small fixed volume contains on an average 20 red cells for normal persons. Using the Poission distribution, find the probability that a specimen of blood taken from a normal person will contain less than 15 red cells.

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The correct Answer is:
`underset(r=0)overset(14)sum e^(-20).(20^( r ))/(r!)`
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