1.

If the mean of 3, 1, 5, x and 9 is 4 thenthe value of x is​

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Mean = (3+1+5+x+9)/5

4 = (3+1+5+x+9)/5

20 = 18 + x

x + 18 = 20

x = 20 - 18

x = 2



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