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Mathematics, 20.12.2021 17:50 Arealbot

The blood bank at a hospital has 1,200 units of blood, out of which 37% units are of blood group B+. A clinical researcher randomly selects 300 units of blood and finds that 33% of those are of blood group B+. To test his result, he randomly selects 200 units of blood and finds that 40% of those are of blood group B+. Which of the following is the reason there is a difference between the two percentages selected by the researcher?

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The blood bank at a hospital has 1,200 units of blood, out of which 37% units are of blood group B+....

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