A private railway company has just purchased a computer for its new automated reservations system. Available seats on ea

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A private railway company has just
purchased a computer for its new automated reservations system.
Available seats on each train of the railway having capacity of
only 100 seats. The owner suspects that the system may be allowed
more than 100 capacity in each train. They decided to take a sample
of 20 trains to see if the average reserved seats are greater than
100.
Explain your answers.