Bài 1: Điều tra số con trong 30 gia đình ở một khu vực dân cư người ta có bảng số liệu thống kê ban đầu sau đây: 2 4 3 2 8 2 2 3 4 5 2 2 5 2 1 2 2 2 3 5 5 5 5 7 3 4 2 2 2 3 Hãy cho biết: a. Dấu hiệu cần tìm hiểu. Gía trị của dấu hiệu. b. Số đơn vị điều tra c. Số các giá trị khác nhau của dấu hiệu. d. Các giá trị khác nhau của dấu hiệu và tần số của chúng. Bài 2: Điều tra về sự tiêu thụ điện năng (tính theo kwh) của 20 gia đình ở một tổ dân phố, ta có kết quả sau: 165 85 65 65 70 50 45 100 45 100 100 100 100 90 53 70 140 41 50 150 Hãy cho biết: a. Dấu hiệu cần tìm hiểu. b. Số đơn vị điều tra c. Các giá trị khác nhau của dấu hiệu và tần số của chúng. Bài 3: Chọn 60 gói chè một cách tùy ý trong kho của một cửa hàng và đem cân, kết quả được ghi lại trong bảng dưới đây Khối lượng từng gói chè (tính bằng gam) 49 48 50 50 50 49 48 52 49 49 49 50 51 49 49 50 51 49 51 49 50 51 51 51 50 49 47 50 50 50 52 50 50 49 51 52 50 49 50 49 51 49 49 49 50 50 51 50 48 50 51 51 51 52 50 50 50 52 52 52 Hãy cho biết: a. Dấu hiệu cần tìm hiểu. Số tất cả các giá trị của dấu hiệu; b. Số các giá trị khác nhau của dấu hiệu; c. Viết các giá trị khác nhau của dấu hiệu và tìm tần số của chúng

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