Question

Can someone help with 11 & 13

Answer 1

`11. \: we \: know \: that \\ (sum \: of \: all \: quantities)/(number \: of \: quantities) = mean \\ => (7 + 11 + 13 + 6 + 8 + x)/(6) = 8 \\ = > (45 + x)/(6) = 8 \\ = > 45 + x = 8 \: * 6 \\ = > 45 + x = 48 \\ = > x = 48 - 45 \\ = > x = 2 \\ \\ 12. we \: know \: that \\ (sum \: of \: all \: quantities)/(number \: of \: quantities) = mean \\ => (2 + 5 + 1.3 + 2.2 + x)/(5) = 1.8 \\ = > (10.5 + x)/(5) = 1.8 \\ = > 10.5 + x = 5 * 1.8 \\ = > 10.5 + x = 9 \\ = > x = 9 - 10.5 \\ = > x = - 1.5 \\`[/tex]

This is the answer.

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