2:39 OK 3 sur 3 9. Find the following in the set of numbers: 4, 9, 12, 7, 9 A. Mean B. Median C. Mode D. Range E. Variance F. Standard deviation 10. Considering a standard normal distribution answer the following questions: A. A researcher grouped his data to include from two standard deviations (SD) below the median to one SD above the mean. Approximately what percentage of the total data was selected? B. What is the approximate percentage of a selected group that is above the 50" percentile and within two standard deviations of the mean? 11. Helen earned a score of 745 on a standardized science test. The mean test score was 800 with a standard deviation of 100. What proportion of students had a higher score than Helen? (Assume that test scores are normally distributed.) 12. In the toss of 5 coins, what is the probability of obtaining 3 heads and 2 tails? 13. Convert the following male heights (cm) into ranks Male ID 4 5 6 Height 350 298 245 190 298 200 Rank 14. In a trial of twelve jurors, the makeup of the jury contained one African American juror. The population of the county is 79,626 with 26% of the population African American. Is this sufficient evidence to conclude racial bias? 15. The heights (in centimeters) of 9 squirrels are given below. Calculate the confidence intervals for the population mean at 99%, 95%, and 90% 19.9 17.4 19.3 31 3