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May 3, 2014 · For example, for 9 people you are adding up 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8, which is equal to 1 2 ⋅ 8 ⋅ 9 = 72 2 = 36 and for 10 people you may compute 1 2 ⋅ 9 ⋅ 10 = 90 2 = 45.
Here is a "non-formal" combinatoric way. All sums of two digits 0,1,…,9 can be represented in a square pattern (primary-school addition table): 0 1 2 ⋮ 8 9 1 2 ⋮ 9 10 2 3 10 11 3 4 11 12 4 5 12 13 5 6 13 14 6 7 14 15 7 8 ⋮ 15 16 8 9 10 16 17 9 10 11 ⋮ 17 18 ...
Aug 24, 2016 · On line 8, there are 7 previous lines. We can make 11 by pairing the first number of each line with the second number of another line: we can pair 1 with 10, 2 with 9, 3 with 8, 4 with 7, 5 with 6, 6 with 5, and 7 with 4.
Find the sum of the following number sequence: 1+2+3+4+5 +6 +7+8+9+10 ? 55 Explanation: Add the first and the last numbers of the sequence and repeat for the other sets of numbers. 1+10 = 11 2+9 = 11 3+8 = 11 ...
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Find step-by-step Probability solutions and your answer to the following textbook question: Given the following data set: 8, 7, 1, 4, 6, 6, 4, 5, 7, 6, 3, 0 a. Find the five-number summary and the IQR. b. Calculate $\overline {x}$ and s. c. Calculate the z-score for the smallest and largest observations. Is either of these observations unusually large or unusually small?.
