Năm 2015-2016 Môn: Toán – Đại Số Chương III Lớp: 7 Thời gian: 45 phút (không kể thời gian giao đề) ĐỀ 1. Bài 1: (4 điểm) Một giáo viên thể dục đo chiều cao (tính theo cm) của một nhóm học sinh nam và ghi lại ở bảng sau : 138 141 145 145 139 141 138 141 139 141 140 150 140 141 140 143 145 139 140 143 a) Lập bảng tần số? b) Thầy giáo đã đo chiều cao bao nhiêu bạn? c) Số bạn có chiều cao thấp nhất là bao nhiêu? d) Có bao nhiêu bạn có chiều cao 143 cm? e) Số các giá trị khác nhau của dấu hiệu là bao nhiêu? f) Chiều cao của các bạn chủ yếu thuộc vào khoảng nào? Bài 2: (6 điểm) Số lỗi chính tả trong một bài kiểm tra môn Anh văn của học sinh của lớp 7B được cô giáo ghi lại trong bảng dưới đây ? Giá trị (x) 2 3 4 5 6 9 10 Tần số (n) 3 6 9 5 7 1 1 N = 32 a) Dấu hiệu là gì ? Tìm mốt cảu dấu hiệu b) Rút ra ba nhận xét về dấu hiệu? c) Tìm số lỗi trung bình trong mỗi bài kiểm tra? d) Dựng biểu đồ đoạn thẳng? BÀI LÀM ....................................................................................................................................................................................................................................................................................................................................................... ....................................................................................................................................................................................................................................................................................................................................................... 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ĐỀ KIỂM TRA MỘT TIẾT NĂM HỌC 2015 - 2016 Môn: Toán – Đại Số Chương III Lớp: 7 Thời gian: 45 phút (không kể thời gian giao đề) ĐỀ 2. Bài 1: (4 điểm) Điểm số trong các lần bắn của một xạ thủ thi bắn súng được ghi lại như sau 8 9 10 8 8 9 10 10 9 10 8 10 10 9 8 7 9 10 10 10 a) Lập bảng tần số? b) Xạ thủ đã bắn bao nhiêu phát súng? c) Số điểm thấp nhất của các lần bắn là bao nhiêu? d) Có bao nhiêu lần xạ thủ đạt điểm 10 ? e) Số các giá trị khác nhau của dấu hiệu là bao nhiêu? f) Tìm tần số của điểm 8? Bài 2: (6 điểm) Điểm kiểm tra học kì I môn toán của học sinh lớp 7 A được ghi lại như sau: Giá trị (x) 2 4 5 6 7 8 9 10 Tần số (n) 2 5 4 7 6 5 2 1 N = 32 a) Dấu hiệu là gì ? Tìm mốt của dấu hiệu ? b) Rút ra ba nhận xét về dấu hiệu? c) Tìm số trung bình cộng? d) Dựng biểu đồ đoạn thẳng bài làm 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HƯỚNG DẪN CHẤM CHÍNH THỨC ĐÁP ÁN ĐỀ 1 Bài Nội dung Điểm 1 3 4đ a) Chiều cao (x) 138 139 140 141 143 145 150 Tần số ( n) 2 3 4 5 2 3 1 N = 20 1,5 b) Thầy giáo đã đo chiều cao của 20 bạn 0,5 c) Số bạn có chiều cao thấp nhất là hai bạn 0,5 d) Có hai bạn cao 143cm 0,5 e) Số các giá trị khác nhau của dấu hiệu là 7 0,5 f) Chiều cao của các bạn chủ yếu thuộc vào khoảng 140cm đến 141cm 0,5 2 6đ a) Dấu hiệu là: Số lỗi chính tả trong một bài kiểm tra môn Anh văn của từng học sinh lớp 7B Mốt của dấu hiệu là: M0 = 4 (lỗi) 1,25 0,5 b) Một số nhận xét - Có một bài kiểm tra mắc lỗi nhiều nhất là 10 lỗi, chiếm tỉ lệ 3,1% - Có ba bài kiểm tra mắc lỗi ít nhất là 2 lỗi chiếm tỉ lệ 9,3% - Phần nhiều bài kiểm tra mắc 4 lỗi chiếm tỉ lệ 27,9% 0,25 0,25 0,25 c) * Số trung bình cộng : X = = 4.6 (lỗi) 1,5 d) 2 Tổng 10đ Chú ý: Bài 1: Nếu HS nêu mốt của dấu hiệu thiếu đơn vị trừ 0,25đ Bài 2: - Xác định dấu hiệu nếu HS nêu chưa cụ thể GV cho nửa số điểm phần đó so đáp án - HS có thể có nh
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