jika mean data tersebut=7,2, nilai x adalah a. 2 b. 3 c.4 d.5

7,2 = 5.2+6.4.+7.2+8x+9.2 + 10.1
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11+x
79,2+ 7,2x= 10+24+14+8x+18+10
79,2=76+0,8x
3,2 =0,8x
x=4

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