Bài 1 (2 điểm): Số điện năng tiêu thụ của 20 hộ gia đình trong một tháng (tính theo kWh) được ghi lại ở bảng sau:

101
70 152
65 65
70 85
120 70
115 85
120 70
115 65
90 65
40 55
101
a) Dấu hiệu ở đây là gì?

b) Hãy lập bảng “tần số”.

c) Hãy tính số trung bình cộng và tìm mốt của dấu hiệu

the correct answer is a.) bc< mn 5 stars if this you : )

step-by-step explanation:

i have no idea just need points sorry

step-by-step explanation:

d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.