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if family income in a local community is normally distributed with a mean of $30,000and standard...

if family income in a local community is normally distributed with a mean of $30,000and standard deviation of $2,500 determine the following:

1. the percent of families with income greater than $27,000

2. the percent of families with income between $28,000 and $31,000

3. if there were two thousand families in the community, how many have income less than $25,000

Math   Statistics-And-Probability   
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