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The Bronx residents smoke in the average 10 cigarretes a day. Assuming that amoking in the...

The Bronx residents smoke in the average 10 cigarretes a day. Assuming that amoking in the Bronx has a normal distribution with standard deviation 8 what percentage of the Bronx amoke at least a pack of (20) cigarretes a day
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Answer #1

Percentage of the Bronx amoke at least a pack of (20) cigarretes a day

= P(X > 20)

20 10 P(z 8

= P(z > 1.25)

= 0.1056

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