, 22.06.2019 21:00 shubbs1038a

# Blood type ab is somewhat rare in the united states and is particular useful for plasma transfusions because this plasma can be accepted by individuals with all blood types. a particular blood donation center sees an average of 2.25 ab donors per day. you decide to count the number of ab donors that come to this center on each of 36 randomly chosen days and compute the average number per day. what is the standard deviation of the average number of ab donors at this center per day during the 36 randomly chosen days?

the k side

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if the probability is 1/12, 75 people will receive a \$25 gift card

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