the numbers in the x column are 14
26
35
47
52
60
69
the numbers in the y column are
22
27
39
42
45
48
56
How do you figure ∑xy?
2007-04-24 5:56 pm
回答 (2)
2007-04-24 5:59 pm
✔ 最佳答案
26*22+35*27+...+69*56just multiply each x value with its corresponding y value and add the products.
2007-04-24 6:14 pm
IF the numbers in the x column are
14, 26, 35, 47, 52, 60, 69
and the numbers in the y column are
22, 27, 39, 42, 45, 48, 56
THEN (n=7)
SUM(XY) = x[0]*y[0] + x[1]*y[1] + .... + x[n]*y[n]
=
14*22 + 26*27 + 35*39 + ... + 69*56
14, 26, 35, 47, 52, 60, 69
and the numbers in the y column are
22, 27, 39, 42, 45, 48, 56
THEN (n=7)
SUM(XY) = x[0]*y[0] + x[1]*y[1] + .... + x[n]*y[n]
=
14*22 + 26*27 + 35*39 + ... + 69*56
收錄日期: 2021-04-15 21:07:50
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