3. A recent national study showed that approximately 55.8% of college students have used Google as a source in at least

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3 A Recent National Study Showed That Approximately 55 8 Of College Students Have Used Google As A Source In At Least 1 (157.78 KiB) Viewed 162 times

3. A recent national study showed that approximately 55.8% of college students have used Google as a source in at least one of their term papers. Let X equal the number of students in a random sample of size n = 42 who have used Google as a source: 1. How is X distributed? 2. Sketch the probability mass function (roughly). 3. Sketch the cumulative distribution function (roughly). 4. Find the probability that X is equal to 17. 5. Find the probability that X is at most 13. 6. Find the probability that X is bigger than 11. 7. Find the probability that X is at least 15. 8. Find the probability that X is between 16 and 19, inclusive 9. Give the mean of X, denoted IE X. 10. Give the variance of X. 11. Give the standard deviation of X. 1 12. Find IE(4x + 51:324) 13. Compare mean and variance -