(a) Construct a stem-and-leaf display, splitting the stems, for the 63 ATM transaction times. Describe the shape of the distribution of transaction times Stem unit 10 Leaf unit 1 0 Frequency Stem Leaf 27 3 2,2,2,2,2,2,2,2,2,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4 22 V 3 5,5,5,5,5,5,5,6,6,6,7,7,7,7,7,8,8,9,9,9,9,9 11 4 0,0,0,1, 1, 1,2,2,2,3,4 40 6 2 0 5 1 ,2 Distribution is skewed right 4 (b) When we compute the sample mean and sample standard deviation for the transaction times, we find that x = 36.56 and s = 4.475. Compute each of the intervals [x + s], [x + 2s], and [x + 3s]. Then count the number of transaction times that actually fall into each interval and find the percentage of transaction times that actually fall into each interval. (Round your answers to 3 decimal places.) [x(bar) + s] 32.085 41.035 1: 42.857 X % [x(bar) + 2s] 27.610 45.510 1: 68.254 X [x(bar) + 3s] 23. 135 49.985 1: 93.651 X %