the mean of three numbers a, b, c is 8and the mean of five numbers a, b, c, d, and e is 15.find the mean of d and e
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3a+b+c =8⇒a+b+c=24 _Eq-15a+b+c+d+e =15⇒a+b+c+d+e=75 _Eq-2Subtract Eq-1 from Eq-2 ,d+e=51⇒ 2d+e =25.5So, Mean of d and e is 25.5.
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