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3.3 œÎµÁ‡¦ºÉ°Š¤º°Åž®µ‡nµ‡ªµ¤ÁºÉ°¤´Éœ—´Šœ¸Ê
1) œÎµÂŸœ„µ¦‹´—„µ¦Á¦¸¥œ¦¼o „¨»n¤µ¦³„µ¦Á¦¸ ¥œ¦¼o ´Š‡¤«¹ „¬µ «µœµÂ¨³ª´•œ›¦¦¤¤¸ 2 ‡º°ÂŸœ„µ¦‹´—„µ¦
Á¦¸¥œ¦¼oץčoœª‡·—Ž·žžµÁ¤ºÉ°¡·‹µ¦–µÃ—¥£µ¡¦ª¤Áž} œ¦µ¥—oµœ¡ªn µ —oµœµ¦³Îµ‡´°¥¼nĜ¦³—´¤µ„š¸É » — ( X = 4.66) Ÿ¨„µ¦
Á¦¸¥œ¦¼oš¸É ‡µ—®ª´ŠÂ¨³µ¦³„µ¦Á¦¸¥œ¦¼o°¥¼nĜ¦³—´¤µ„ ( X = 4.37) ‹»—ž¦³Š‡r „µ¦Á¦¸¥œ¦¼o°¥¼nĜ¦³—´¤µ„ ( X = 4.35) „·‹„¦¦¤