Find the value of x,if the mean of 28,36,20,x,4,8,13,11 is 17?
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17 = 28+36+20+x+4+8+13+11 ÷ 8
17 = 120+x ÷ 8
17×8 = 120 + x
136 = 120 + x
136 - 120 =x
16 = x
x = 16
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