1.

Find the value of x, if the mean of 18, 5, 3, 12, 17, 10, x, 6, 6 is 9.n The mean attendance of a school for the first. four days of the week was 780

Answer»

18+5+3+12+17+10+x+6+6/9 = 9

77+x = 81

x = 81-77

x = 4

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