#1
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* ¶éÒÁÕ¹Ã. 10 ¤¹ ä´é¤Ðá¹¹ ¤¹ÅÐ 32 ¤Ðá¹¹ ¤Ðá¹¹Êͺ¢Í§¹Ã. 50 ¤¹·ÕèàËÅ×ÍÁÕ¤ÇÒÁá»Ã»Ãǹà·èÒã´ ¢ÍÇÔ¸Õ·Ó´éǹФÃѺ
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#2
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¢é͹ÕéãªéÊٵâͧ¤ÇÒÁá»Ã»ÃǹÃÇÁ ·ÕèÁÕ¤èÒà©ÅÕèÂàÅ¢¤³ÔµäÁèà·èҡѹ¤ÃѺ
â´Â ÃÇÁÁÕ 60 ¤¹ ¨Ðä´é $s^2 = 100 $ áÅÐ $ \overline{x} =\frac{1320}{60}=22 $ ¡ÅØèÁááÁÕ 10 ¤¹ ¨Ðä´é $s^2 = 0 $ áÅÐ $ \overline{x} =32$ à¹×èͧ¨Ò¡¤Ðá¹¹à·èҡѹËÁ´ ¡ÅØèÁ·ÕèÊͧ ÁÕ 50 ¤¹ $\overline{x} =\frac{1000}{50}=20$ ¨Ò¡¹Ñé¹Å᷹ͧ¤èÒÊٵô٤ÃѺ¨Ðä´é¤ÓµÍºà·èҡѺ 96 |
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