#1
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ʶԵԤÃѺªèÇ·Õ
㹡ÒÃÊͺÇÔªÒ˹Ö觹ѡàÃÕ¹ 2Ëéͧ ä´é¤Ðà๹à©ÅÕè 60 ¤Ðà๹ â´Â·ÕèËéͧààáÁÕ¨Ó¹ÇùѡàÃÕ¹ 40 ¤¹ Ëéͧ·ÕèÊͧ 30 ¤¹ »ÃÒ¡®ÇèÒËéͧààáÁÕ Med=64, Mo=60 ¨§ËÒ¤èÒà©ÅÕèÂàÅ¢¤³Ôµ¢Í§»ÃЪҡâͧËéͧ·Õè2
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#2
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¨Ò¡¤ÇÒÁÊÑÁ¾Ñ¹¸ì \bar x, Med, Mo ¤×Í $\bar x - Mo = 3(\bar x - Me)$
Ëéͧ·Õè 1 ÁÕ Med=64, Mo=60 á·¹à¢éÒä» ¨Ðä´é $\bar x$ ¢Í§Ëéͧ 1 = 66 $\bar x_{ÃÇÁ} = \frac{n_{1}\bar x_{1}+n_{2}\bar x_{2} }{n_{1}+n_{2}}$ á·¹¤èÒ à¢éÒä» $60 = \frac{(40)(66)+(30)\bar x_{2} }{40+30}$ $\bar x_{2} = 52$ |
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