Kiểm tra toán đại số lớp 7 năm 2015-2016

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