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Sergio [31]
3 years ago
8

What is the area of the figure

Mathematics
1 answer:
Free_Kalibri [48]3 years ago
7 0

Answer:

416 cm²

Step-by-step explanation:

First, I found the area of the rectangle without the triangles on the side:

14 • 16 = 224

Then, I had to find the length of the base of the triangles:

38 - 14 = 24

Assuming the triangles are the same, 24/2 = 12 cm for one triangle

I found the area of the triangles:

16 • 12 = 192

**192/2 = 96

**Since there are two triangles you would multiply the 96 by 2 which cancels out the divide by two. Technically, you can skip this step for this question.

Then you just add them together: 192 + 224 = 416 cm²

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Một lô hàng chứa rất nhiều sản phẩm, trong đó tỷ lệ sản phẩm loại tốt là 70%. chọn ngẫu nhiên từ lô hàng ra 5 sản phẩm. gọi X là
den301095 [7]

trả lời : lâp bảng

X=0 thì xác suất lấy ra được sản phẩm tốt là 5*30%=1,5%

X =1 thì xác suất lấy ra được là 1* 70%*4*30%=0,84%

X=2 thì xác suất lấy ra được sản phẩm tốt là 2*70%*3*30%=1,26%

X=3 thì xác suất lấy ra được sản phẩm tốt là 3*70%*2*30%=1,26%

X=4 thì xác suất lấy ra được sản phẩm tốt là 4*70%*1*30%=0,84%

X=5 thì xác suất lấy ra được sản phẩm tốt là 5*70%=3,5%

X 0 1 2 3 4 5

P 1,5 0,84 1,26 1,26 0,84 3,5

b,

E(x)= 1,5*0+ 0,84*1+1,26*2+1,26*3+0,84*4+3,5*5=28

E(x^2)=1,5*0^2+0,84*1^2+1,26*2^2+1,26*3^2+0,84*4^2+3,5*5^2=118,16

===> V(x)= (E(x))^2-E(x^2)=28^2-118,16=665,84

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