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Q4) Two batteries, with voltages VI and V2, are connected in series. The total voltage V is given by V=V1+V2. Assume that V1 has

Q4) Two batteries, with voltages VI and V2, are connected in series. The total voltage V is given by V=V1+V2. Assume that V1 has mean 12 V and standard deviation 1 V, and that V2 has mean 6 V and standard deviation 0.5 V. a. Find v. b. Assuming VI and V2 to be independent, find r.

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