1. If the lowest class interval of the set of data {67, 90, 83, 85, 73, 80, 78, 79, 68, 71} is 65-70, find the class mark of that interval. A. 2 B. 65 C. 70 D. 67.5 Hint 2. In a stem-and-leaf plot, what could 8|1 represent? A. 0.81 B. 8100 C. 81 D. all of these Hint 3. The second quartile point is also called the ______. A. mean B. median C. range D. mode Hint 4. Given the partial table below, identify the upper and lower limits of an interval about the mean within which 45% of the values of a set of data can be found if the mean is 30.5 and the standard deviation is 13.8. Assume the data are normally distributed. A. 26.3-34.7 B. 22.22-38.78 C. 9.6-18.0 D. 5.5-22.1 Hint 5. Approximately what percent of the data is between 11 and 50 if the mean is 30.5 and the standard deviation is 13.8, given the partial table below? Assume the data are normally distributed. A. 80.7% B. 90.0% C. 83.8% D. 68.3% Hint 6. Use the partial table below. If = 6.4.0, N = 100, and = 37.1, find the interval about the sample mean that has a 1% level of confidence. A. about 35.45-38.75 B. about 35.85-38.35 C. about 36.04-38.16 D. about 35.18-39.02 Hint 7. The set of data below shows the number of candles sold for each day of a school fund-raiser. Name the interval that describes the most candles sold.4, 19, 28, 33, 26, 8, 14, 18, 21, 35, 36, 11, 25, 11,13, 44 A. 10–20 B. 30–40 C. 20–30 D. 0–10 Hint 8. Find the value of x so that the median of {4, 9, 6, 4, 4, 10, 5, x, 8, 9} is 6.5. A. 8 B. 6 C. 7 D. 5 Hint 9. Find the mean deviation of the data below.36, 49, 65, 77, 70, 49, 40, 58, 76, 73, 58, 39 A. 10.631 B. 12.417 C. 11.854 D. 12.263 Hint 10. From a population of 1,000 items, a sample of 750 is chosen and found to have a standard deviation of 33. Find the standard error of the mean. A. 1.04 B. 2.6 C. 3.65 D. 1.2 Hint