Question

A long distance carrier defines a late connection to be one that takes more than 5 seconds to make. It randomly selects 850 phone calls each hour at a particular switching station during the peak hours of operation and determines how many of these calls are late.
If it is known that the probability of a late connection is 0.0175 then find the probability that there are fewer than (less than) 13 late calls per hours?
Use the Normal approximation to the Binomial distribution.
Your answer can be rounded to three decimal digit accuracy when entered.

Probability is =

Answer 1

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