4. Toss a coin three times. Let X be the number of Head's observed. Find pmf for X, make a probability histogram for X and then find mean and variance for X. 5. A data is given as follows: 10, 21, 24, 27, 31, 35, 37, 38, 38 Describe and summarize the data. (At least include mean, median, mode, variance, standard deviation, outlier and boxplot) 6. X is a normally normally distributed variable with mean p = 30 and standard deviation o = 4. Find a) P(x 21) c) P(30