Oh, dude, the range is just the difference between the highest and lowest numbers in a set. So, for those numbers, you'd subtract the smallest (49) from the largest (96) to get 47. That's it, like, super simple math, man.
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To find the mean of a set of numbers, you add all the numbers together and then divide by the total number of values. In this case, the sum of 96, 49, 68, and 75 is 288. Dividing 288 by 4 (the total number of values) gives you a mean of 72.
96 - 14 = 82
96-28 = 68
Dividing 96 in the ratio 48:1 gives the two parts as 48/49 and 1/49 of the total. So the first part is 48/49*96 and the second is 1/49*96, that is, 94.041 and 1.959
96 + 44 = 140 140 + 168 = 308 as there are four numbers, divide by 4 308 / 4 = 77