Only Do Question #1 and #2 on the worksheet. Before you upload your file, ensure your name appears on the top of every page of your document. Keep a copy of your work on your hard drive. The worksheet "Percentiles" will provide an opportunity to practice the different aspects of percentiles. Be sure to show all of your steps. Start questions involving formulas by writing down the formula and then substituting for the variables in the formula.The worksheet "Measures of the Variability of Data Assignment" will provide an opportunity to practice the different variance and standard deviation calculations. Be sure to show all of your steps. Start questions involving formulas by writing down the formula and then substituting for the variables in the formula.1. Find the mean and standard deviation of the number of songs on 8 students' iPods. 2. The scores on an IQ test for 60 selected students are shown in the table. Find the mean score and the standard deviation 1D!) to under 106 106 to under 112 1l3 112 to under 118 24 | 113 tounder'124 | 11 124 to under 130 4 3. Find the mean and the standard deviation for each of the following sets of data. For the calculations assume a), b} are populations, while c} and d) are samples. lflTlTli \"i 1 to under 3 I4 3 to under 5 I 8 5 to under ? I 5 T to under 9 I 1 9 to under 11 | 2 20 to under 25 I 1 25 to under 30 I E 30 to under 35 I 10 35 to under 45 I 2 4D to under 45 I 1. Eighteen executives reported the following number of telephone calls made during a randomly selected week. 22 14 12 54 12 16 12 14 49 10 14 8 21 37 28 36 22 For this information determine the following: a. 1st decile, b. P 34, c. median, d. third quartile. Hint: Remember, to determine the values of percentiles, the data must first be arranged in an array. 2. The growth (in centimeters) of a certain variety of plant after 20 days is shown below. 20 12 39 38 41 43 51 52 59 55 53 59 50 58 35 38 23 32 43 53 For this information determine the following: a. D2, b. Q1, c. median, d. 7th decile