A survey indicates that 20% of parents use spanking as a discipline strategy.  Among those parents who spank, 70% believe a kid should always obey the parent. Among those parent who do not spank, 10% believe a kid should always obey the parent. Which of the following gives the probability that a randomly selected parent believe that a kid should always obey the parent? a) (0.2)(0.7) + (1-0.2)(0.1) b) (0.2)(0.7) + (0.2)(0.2) c) 0.7 + 0.1 d) 0.2 + 0.7

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A survey indicates that 20% of parents use spanking as a discipline strategy. 

Among those parents who spank, 70% believe a kid should always obey the parent.

Among those parent who do not spank, 10% believe a kid should always obey the parent.

Which of the following gives the probability that a randomly selected parent believe that a kid should always obey the parent?

a) (0.2)(0.7) + (1-0.2)(0.1)
b) (0.2)(0.7) + (0.2)(0.2)
c) 0.7 + 0.1
d) 0.2 + 0.7
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