A sortie of 20 aeroplanes is sent on an operational flight. The chances that an aeroplane fails to return is 5%. Find
the probability that (i) one plane does not return (ii) at the most 5 planes do not return, and (iii) what is the most
probable number of returns ?
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Answered by
13
Answer:
One plane does not return = (1/20)(19/20)¹⁹
the most probable number of returns = 19
Step-by-step explanation:
probability of aerplane not returning = 5% = 5/100 = 1/20
Probability aeroplane returns = 1 - 1/20 = 19/20
One plane does not return means
other 19 planes returns
(1/20)(19/20)¹⁹
the most probable number of returns = (19/20) * 20 = 19
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0
Answer:
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