In a group of 1500 people, 585 have blood type A, 165 have blood type B, 690 have blood type O, and 60 have blood type AB. What is the probability that a person chosen at random from this group has type B blood?

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When calculating probability you need to remember that probability is: something that you are observing divided by total number of participants. The number you get is relative value(has value between 0 and 1) and if you want to get it in percentage (more clearly) just multiply it with 100. In this case we are observing blood type B persons. Number of them is 165. Total number of persons is 1500. Therefore our calculation looks like this: 165/1500 = 0.11    or  the probability is 0.11*100=11%

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