Tổng số học sinh nam khối lớp 9 là: 28 + 37 + 30 + 10 + 15 = 120 (học sinh).

Số học sinh nam đi các cỡ giày 36, 37, 38, 39, 40 tương ứng là 28, 37, 30, 10, 15 học sinh.

Ta có bảng tần số như sau:
 

Tỉ lệ học sinh nam đi các cỡ giày 36, 37, 38, 39, 40 tương ứng là:

$\frac{28}{120}.100=23,33\%;$ $\frac{37}{120}.100=30,83\%;$ $\frac{30}{120}.100=25\%;$

$\frac{10}{120}.100=8,34\%;$ $\frac{15}{120}.100=12,5\%.$

Ta có bảng tần số tương đối như sau:
 

My dream house is a modern villa located by the beach, surrounded by fresh air, golden sands, and blue waves. It is a spacious house with large glass windows, white walls, and a beautiful garden full of colorful flowers, green grass, and tall palm trees. Inside the house, there are three bedrooms, a cozy living room, a fully equipped kitchen, and a balcony with a sea view. I will decorate the house with simple furniture, soft rugs, and elegant curtains. On the walls, I will hang paintings, family photos, and inspirational quotes. This house will be a peaceful place where I can relax, enjoy nature, and spend quality time with my loved ones.