Kiểm tra Đại số 10 - Chương 5

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kiỂm tra Đại số 10- chương 5
 Đề 2 
Bài toán : Thăm dò số giờ tự học ở nhà trong 10 ngày của 50 học sinh lớp 10 được ghi lại theo bảng mẫu số liệu phân bố tần số ghép lớp sau : 
Lớp
Tần số
[ 0 ; 9 ]
17
[ 10 ; 19 ]
21
[ 20 ; 29 ]
7
[ 30 ; 39]
[ 40 ; 49 ]
1
N =
a) Điền vào ô trống còn thiếu . 
b) Bổ sung cột tần suất ghép lớp để hình thành bảng phân bố tần số-tần suất . Dựa vào bảng thống kê 
 hãy nhận xét ý thức tự học của các học sinh được điều tra.
c) Trung bình mỗi học sinh một ngày tự học bao nhiêu tiếng .
d) Có bao nhiêu % số học sinh trong số được điều tra học trung bình không dưới 2 giờ trong 1 ngày.
e) Vẽ biểu đồ đường gấp khúc tần số 
f) Tính độ lệch chuẩn .
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