About18%ofalltheflashdrivesproducedinafactoryarered,i.e., p?0.18.Anofficemanagerinahealthcare company bought n ? 12 such flash drives. Treat these 12 flash drives as a random sample and use X to denote the number of red flash drives in this sample. Keep at least 4 decimal digits if the result has more decimal digits. 1. The expected value ? of X is (2)
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