Question: A study of a new cholesterol drug measures the decrease in LDL (the bad cholesterol) of a group of 5 of patients. The recorded changes

A study of a new cholesterol drug measures the decrease in LDL (the "bad" cholesterol) of a group of 5 of patients. The recorded changes in cholesterol were -20.4, -18.0, -7, -2.8, -3.2. What is the expected value of the drop in cholesterol for this drug?

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