1. Considering a standard normal distribution answer the following questions: A. What is the approximate percentage of a selected group that is below the 50"h percentile and within one standard deviation of the mean? B. A researcher grouped his data to include from two SDs above the median to one SD below the median. Approximately what percentage of the total data was selected? 2. Circle ALL that apply. A Gauss curve, the curve of a normal distribution, has the following features (where m = mean, s = standard deviation): A. in the interval [m - 1s; m + 1s] about 2/3 (" 68%) of the series' values are located B. in the interval [m - 2s; m + 2s] about 95%% of the series' values are located C. in the interval [m - 3s; m + 3s] about 99% of the series' values are located D. in the interval [m- 1s; m + 1 s] about 50% of the series' values are located 3. A coin is tossed three times. What is the probability that it lands on heads two times? 4. In the toss of 6 coins, what is the probability of obtaining 2 heads and 4 tails