The distance between two European cities is about 3500 km. Convert this to miles. 72 81 83 66 75 80 75 79 76 76 69 75 74 85 5. The heights in feet of 31 trees are: 70 65 63 86 71 64 78 80 74 72 77 81 82 80 80 80 87. a) Find the minimum observation c) Find the range of the data class width f) Find the boundaries of the first class b) Find the maximum observation d) If you want to prepare a frequency table with 6 classes, find the e) Find the class limits of the first class g) Find the midpoint of the first class