KIEM TRA DAI 7 CIII

<span class='text_page_counter'>(1)</span>Trêng THCS L¬ng mü. Hä vµ tªn ............................................ Líp 7B §iÓm. Bµi kiÓm tra 45 phót M«n §¹i sè líp 7 Ngµy 5/2/2013 Lêi phª cña thÇy, c« gi¸o. (Häc sinh lµm trùc tiÕp vµo bµi kiÓm tra nµy) §Ò bµi: Điều tra điểm kiểm tra 1 tiết môn đại số của học sinh lớp 7C đợc cho bởi bảng sau: 3 8 5 6 5 5 4 7 8 3 6 4 7 7 7 8 5 5 3 8 6 3 6 3 7 6 7 7 10 9 8 6 9 10 7 9 4 5 5 7 a/ Tập hợp thống kê đợc điều tra ở đây là gì? b/ DÊu hiÖu ®iÒu tra lµ g×? c/ Cã bao nhiªu gi¸ trÞ cña dÊu hiÖu? Cã bao nhiªu gi¸ trÞ kh¸c nhau cña dÊu hiÖu? d/ LËp b¶ng tÇn sè vµ tÝnh gi¸ trÞ trung b×nh cña dÊu hiÖu? e/ T×m mèt cña dÊu hiÖu? f/ TÝnh % sè häc sinh : Giái, Kh¸, Trung b×nh vµ díi trung b×nh cña líp? Bµi lµm. ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ....................................................................................................................................................................................

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................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... ................................................................................................................................................................................... .................................................................................................................................................................................... §¸p ¸n –BiÓu ®iÓm a/ Tập hợp thống kê đợc điều tra là Lớp 7C b/ Dấu hiệu điều tra là: Điểm kiểm tra 1 tiết môn đại số c/ Cã 40 gi¸ trÞ cña dÊu hiÖu vµ cã 8 gi¸ trÞ kh¸c nhau cña dÊu hiÖu. d/ B¶ng tÇn sè vµ gi¸ trÞ trung b×nh cña dÊu hiÖu lµ: Gi¸ trÞ cña TÇn sè (n) TÝch n.x dÊu hiÖu (x) 3 5 15 4 3 12 5 7 35 6 6 36  7 9 63 X  N 8 5 40 9 3 27 10 2 20  = 248 N=40 e/ Mèt cña dÊu hiÖu lµ: M0 = 7 f/ PhÇn tr¨m sè häc sinh giái lµ:. 10/40 = 25%. (0.5®) (1®) (1®) (5®) X. . 248 6.2 40. (0.5®) (0.5®).

<span class='text_page_counter'>(3)</span> PhÇn tr¨m sè häc sinh kh¸ lµ: PhÇn tr¨m sè häc sinh trung b×nh lµ: PhÇn tr¨m sè häc sinh díi trung b×nh lµ:. 9/40 = 22.5% 13/40 = 32.5% 8/40 = 20%. Ngµy ......... th¸ng ....... n¨m 2013 DuyÖt cña chuyªn m«n. (0.5®) (0.5®) (0.5®).

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