Researchers at the University of Cambridge have been studying how brain shape is linked to cocaine addiction. They determined that sporadic cocaine users (non-addicts) tend to have a larger frontal...

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Extracted text: Researchers at the University of Cambridge have been studying how brain shape is linked to cocaine addiction. They determined that sporadic cocaine users (non-addicts) tend to have a larger frontal lobe (region associated with self-control) while cocaine addicts have a small frontal lobe. It was determined that a cocaine user with a small frontal lobe had a probability equal to 0.7 of becoming addicted to the drug. Researchers conducted a simple random sample of 20 independent cocaine users that had a small frontal lobe.


Extracted text: 20. On average, how many of the 20 cocaine users with a small frontal lobe would you expect to be addicted to cocaine? 10 14 Question 21 21. Can you use the Normal approximation to find the probability that greater than 15 users are addicted to cocaine? Yes No