20% of the US population over the age of 10 years old have been diagnosed with depression....
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20% of the US population over the age of 10 years old have been diagnosed with depression.A sample size of 1000 people in this population have been randomly selected.
a. What is the approximate probability that at least 200 people in the random sample have depression?
b. What is the approximate probability that 150 to 250 people in the random sample have depression?
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