Question 18 of 50 : Select the best answer for the question. 18. Calculate the mean of the following five sample measurements: 21, 25, 42, 48, 50. O A.50 O 3.21 O C. 42 O D. 37.2 Question 24 of 50 : Select the best answer for the question. 24. Evaluate. Express your answer in exact simplest form.8! I4! 0 A. 1,860 O B. 6,180 O C. 2,400 O D. 1,680 Question 27 of 50 : Select the best answer for the question. 27. What graphical device summarizes data by the number of dots above each data value on the horizontal axis? 0 A. Histogram O B. Scatter diagram 0 C. Dot plot 0 D. Stem-and-Ieaf