các bạn giải hộ mình bài xác suất ở đại học này với, thanks nhiu

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huyenhana93

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Chắc suất Đại học top - Giữ chỗ ngay!!

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b1 : có 3 em đồng thời ném bóng vào gôn cùng 1 lúc và chỉ 1 em ném trúng. tìm xác suất để quả bóng trúng gôn đó là do em thứ nhất ném. Biết rằng các e ném độc lập vs nhau và xác suất ném trúng gôn của các em lần lượt là 0,4 0,3 0,6.

b2: có 2 kiện hàng: kiện 1 có 7sp loại 1 và 3 sản phẩm loại 2, kiện 2 có 8 sp loại 1 và 4 sp loại 2
1, lấy ngẫu nhiên 2 sp từ 1 trong 2 kiện, tìm xác suất để 2 sp đều là loại 2( câu này mình làm dc rồi )
2, lấy dc 2 sp từ kiện bất kì là sp loại 2 , tìm xác suất để lấy dc tiếp 2 sản phẩm loại 2 ở kiện còn lại
 
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nguyenbahiep1

b1 : có 3 em đồng thời ném bóng vào gôn cùng 1 lúc và chỉ 1 em ném trúng. tìm xác suất để quả bóng trúng gôn đó là do em thứ nhất ném. Biết rằng các e ném độc lập vs nhau và xác suất ném trúng gôn của các em lần lượt là 0,4 0,3 0,6.

b2: có 2 kiện hàng: kiện 1 có 7sp loại 1 và 3 sản phẩm loại 2, kiện 2 có 8 sp loại 1 và 4 sp loại 2
1, lấy ngẫu nhiên 2 sp từ 1 trong 2 kiện, tìm xác suất để 2 sp đều là loại 2( câu này mình làm dc rồi )
2, lấy dc 2 sp từ kiện bất kì là sp loại 2 , tìm xác suất để lấy dc tiếp 2 sản phẩm loại 2 ở kiện còn lại

Bài 1

câu này liệu có sai đề gì ko nhỉ nếu ko thì làm rất đơn giản

0,4.(1-0,3)(1-0,6) = 0,122

Bài 2

TH_1: lấy được 2 sp loại 2 ở kiện 1 và lấy tiếp được 2 sản phẩm loại 2 ở kiện 2

[laTEX]\frac{C_3^2}{C_{10}^2}.\frac{C_4^2}{C_{12}^2} = \frac{1}{165}[/laTEX]

TH_2: lấy được 2 sp loại 2 ở kiện 2 và lấy tiếp được 2 sản phẩm loại 2 ở kiện 1

[laTEX]\frac{C_4^2}{C_{12}^2}.\frac{C_3^2}{C_{10}^2} = \frac{1}{165}[/laTEX]

đáp án [laTEX]\frac{2}{165}[/laTEX]
 
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Mftuq75

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