I could not understand below questions.

Could you explain the meaning of question, what does the each question's data means, how to solve the question(the meaning of the each answer's explanation) in detail as possible as you can.

Question 19 Not answered Marked out of 1.00 Flag question The USC quarterback Matt Barkley weighed 220 pounds in the spring of 2010. How many standard deviations above or below the mean was he in comparison to the data given above? (Give the answer in the format x.xxx, without the plus/minus sign) Answer: Observe that: (220 - 249.294)/16.340 = -1.792778 The correct answer is: 1.792765 Question 20 Not answered Marked out of 1.00 P Flag question The following frequency table shows the lengths of 42 international phone calls using a $5 prepaid calling card. The data was stored in an object by the name "x": x 4 14 24 34 44 54 2 6 13 13 6 2 Using the data, and without computing the mean and the median, determine which ONE of the answers is correct: Select one: O a. The mean and the median are equal. b. The mean is smaller than the median. c. The mean is larger than the median. Observe that the distribution is symmetric. The values are equally spaced and the frequencies evenly distibuted. The correct answer is: The mean and the median are equal. Question 21 Not answered Marked out of 1.00 P Flag question Consider the following data set: 4, 6, 6, 12, 18, 18, 18, 200. What value is (approximately) 0.75 standard deviations below the mean? Select one: O a. There is not enough information O b. Approximately -15 O c. Approximately 4 O d. Approximately 34.5 Consider the code: > x mean(x) - 0.75*sd(x) [1] -14. 87231 The correct answer is: Approximately -15