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ludmilkaskok [199]
3 years ago
11

Trước đây định mức tiêu dung điện cho 1 hộ gia đình trong 1 tháng là 140KW. Do đời sống nâng cao, người ta theo dõi 100 hô gia đ

ình thu được các số liệu sau: Lượng tiêu dùng 100-120 120-140 140-160 160-180 180-200 Số hộ gia đình 14 25 30 20 11 a. Theo anh (chị) có cần nâng mức tiêu dùng không? Cho α=5%. b. Nếu trước đây mức độ biến động của mức tiêu dung điện cho một gia đình là σ2 = 400. Vậy hiện nay mức độ biến động trên tăng hay giảm? Cho kết luận với mức ý nghĩa α=5%.
Mathematics
1 answer:
hjlf3 years ago
8 0

Answer:

I think we dont need a consumption

Step-by-step explanation:

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