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Combining Random Variables

AP Statistics· difficulty 3/5

For RVs A, B with means 30 and 25, mean of A − B is

  • A

    5

    check_circle
  • B

    Cannot tell

  • C

    55

  • D

    −5

Explanation

E(A − B) = 30 − 25 = 5. Holds even without independence.

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