In 2009, the Global Strategy Group conducted an online survey commissioned by Scotch® Tape of adults nationwide in the United States about their personal gift-wrapping behaviors and trends. One finding was that the average number of presents wrapped by adults in a typical December holiday season is 15.3. In addition, the study found that women wrap more presents than men with women averaging 20.3 and men averaging 9.9. Suppose that these figures obtained from a sample are actually true for the entire population and that the standard deviation for all adults, for women, and for men is 2.5. If a random sample of 35 U.S. adults is taken,

1. What is the probability that the sample mean number of presents wrapped in a typical December holiday season is more than 16?
2. If a random sample of 60 U.S. men is taken, what is the probability that the sample mean number of presents wrapped by a man in a typical December holiday season is less than 10?
3. If a random sample of 43 U.S. women is taken, what is the probability that the sample mean number of presents wrapped by a woman in a typical December holiday season is between 20.0 and 20.8?

Answer rating: 100% (QA)

Data Mean Adults 153 Women 203 Men 99 Standard deviation 25 1 Probability that sampl... View the full answer