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Kwan Checks His Email for New Messages Several Times During

Question 142

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Kwan checks his email for new messages several times during the day. He realizes that because emails are sent on a ________________ schedule, checking his email more frequently will not increase the number of new emails he receives in a day. Furthermore, he knows that he cannot predict when people will email him, but if an email has been sent to him, he will receive it the next time he checks.


A) fixed-ratio
B) fixed-interval
C) variable-ratio
D) variable-interval

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