Question: A particular system is controlled by an operator through commands entered from a keyboard. The average number of commands entered in an 8-hour interval is

A particular system is controlled by an operator through commands entered from a keyboard. The average number of commands entered in an 8-hour interval is 60.
a. Suppose the processor scans the keyboard every 100 ms. How many times will the keyboard be checked in an 8-hour period?
b. By what fraction would the number of processor visits to the keyboard be reduced if interrupt-driven I/O were used?

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