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Kwan Checks Her Email for New Messages Several Times During

Question 49

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


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

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