With 1,2,3,4,5,6,7,8,9, any three components, how many can they be composed with an average of 15? In a hurry

two hundred and seventy-six
nine hundred and fifty-one
four hundred and thirty-eight
This is a nine palace grid, and the sum of the nine numbers in horizontal, vertical and oblique directions is 15

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9. The mean, median and mode of a set of data will not be the same,
10. What level does the mean median mode represent?
11. Add a number in 1,2,3,4,5,6,7,8,9,10, so that the average number of the group is 6, then what is the increased number?
12. Average of 3.5.7 average of 1.2.3.4.5.6.7.8.9
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14. If the average of data x, 2x, 3x, 4x, 5x is 1, then x is (), what is the variance?
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