Thống kê món ăn được ưa thích
| Món ăn | Phở | Nem | Bánh mì |
| Số lượt bình chọn | 972 | 987 | 955 |
Trong Biểu đồ a), cột màu xanh chiếm hơn 3,5 ô; cột màu vàng chiếm khoảng 1,5 ô.
Khi đó, tỉ lệ chiều cao giữa cột màu xanh và cột màu vàng trong Biểu đồ a) khoảng:
\[\frac{3,5}{1,5}=\frac{7}{3} \approx2,03\]
Tỉ lệ số lượt bình chọn nem và bánh mì là:
\[\frac{987}{955} \approx1,03\]
2. Đọc và phân tích số liệu từ biểu đồ
Chú ý: Khi phân tích số liệu, ta có thể kết hợp thông tin từ hai hay nhiều biểu đồ.
Để so sánh sự thay đổi theo thời gian của hai hay nhiều đại lượng, người ta thường biểu diễn chúng trên cùng biểu đồ.
Các biểu đồ sau cho biết cơ cấu năng lượng được khai thác, sản xuất trong nước các năm 2018 và 2019.
Các dạng năng lượng
Các loại năng lượng
Than
Dầu thô
Khí thiên nhiên
Nhiên liệu sinh học
Tỷ lệ (%)
48,23
20,59
16,78
14,62
| Các loại năng lượng | Than | Dầu thô | Khí thiên nhiên | Nhiên liệu sinh học |
| Tỷ lệ (%) | 48,23 | 20,59 | 16,78 | 14,62 |
Sự thay đổi cơ cấu năng lượng được khai thác, sản xuất trong các nước năm 2019 so với năm 2018.
– Than giảm khoảng 0,03% (từ 48,37% xuống còn 45,02%);
– Dầu thô tăng khoảng 2,6% (từ 20,59% lên đến 23,19%);
– Khí thiên nhiên tăng khoảng 0,31% (từ 16,78% lên đến 17,09%);
– Nhiên liệu sinh học tăng khoảng 0,08% (từ 14,62% lên đến 14,70%).
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