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Family incomes have a mean of 60 000 with a standard

Family incomes have a mean of $60 000 with a standard deviation of $20 000. The data are normally distributed.

What is the probability of a randomly chosen family having an income greater than $50 000?
What is the probability that a family income is less than $36 000?
A new tax law designed for the middle class is to help families with incomes from $45 000 to $80 000. What percentage of families will this new law help?

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Mathematics: Family incomes have a mean of 60 000 with a standard

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