SAT, 01.09.2021 09:00 herchellann302
Sắp xếp số liệu theo thứ tự từ nhỏ đến lớn, xác định được Xmax = 145, Xmin = 50.
Với khoảng cách tổ bằng nhau và bằng 10, bảng tần số phân bố được xây dựng như sau:
Năng lượng tiêu dùng
(triệu BTU) Tần số (hộ) Tần suất (lần)
50 – 60 8 0,16
60 – 70 7 0,14
70 – 80 3 0,06
80 – 90 6 0,12
90 – 100 10 0,20
100 – 110 5 0,10
110 – 120 4 0,08
120 – 130 2 0,04
130 – 140 3 0,06
140 – 150 2 0,04
Tổng 50 1,00
Từ đó tính được tần suất theo công thức di= fi/∑ fi
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Sắp xếp số liệu theo thứ tự từ nhỏ đến lớn, xác định được Xmax = 145, Xmin = 50.
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