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$BJ?6QCM$ONI$/;H$o$l$kCM$@$+$i@bL@$OITMW$G$"$m$&$,!"(B $B$3$N>l9g$O3F?K7j$N0LCV$,CzEYBeI=CM$G$"$C$?$H8+$FJ?6QCM$r7W;;$9$l$PNI$$!#(B $BNc$($P(B $-15$ (mm) $B$N=j$K(B 2 $B2sMn$A$?$H9M$($k!#$h$C$F!"J?6QCM(B $\bar{x}$ $B$O(B

$$\bar{x} = \frac{-20\times 1 + (-15)\times 2 + \cdots + 15\times 4+20\times 2}{50} = \frac{105}{50} = 2.1 (\mbox{mm})$$

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