Question 919262
Let


A = event that a family owns a washing machine
B = event that a family owns a DVD player


So, by definition


P(A) = probability that a family owns a washing machine
P(B) = probability that a family owns a DVD player
 

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P(A or B) = P(A) + P(B) - P(A and B)



P(A or B) = 0.68 + 0.81 - 0.58



P(A or B) = <font color="red">0.91</font>



The probability of owning a washing machine, or a DVD player, or both is <font color="red">0.91</font>


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Thanks,


Jim