Debbie keeps her marble collection in a jar. Of the 50 marbles in the jar, 15 are red, 10 are blue, 20 are green and 5 are yellow. Debbie chooses randomly 30 marbles from the jar. How many of these marbles can she expect to be red?
Answer: marbles
Debbie giữ bộ sưu tập đá cẩm thạch của cô trong một cái bình. Trong số 50 viên bi trong bình, 15 màu đỏ, 10 màu xanh, 20 là màu xanh lá cây và 5 là màu vàng. Debbie chọn ngẫu nhiên 30 viên bi từ jar. Bao nhiêu trong số các viên bi cô có thể mong đợi để có màu đỏ?
Trả lời: ... hòn bi
Bản gốc : Debbie keeps her marble collection in a jar. Of the 50 marbles in the jar, 15 are red, 10 are blue, 20 are green and 5 are yellow. Debbie chooses randomly 30 marbles from the jar. How many of these marbles can she expect to be red?
Answer: ... marbles
Giải = tiếng việt cho dễ hiểu.
Ta có: 15/50=3/10 suy ra số viên bi đỏ chiếm 30% tổng số bi trong hộp. Do đó khi lấy 30 viên bất kỳ ta đc số viên bi đỏ là 30 . 30% = 9 viên
Mrs.Lunnah has a jar of beads. There are 30 red beads, 30 blue beads and 30 yellow beads. If a student sticks her hand in a jar and pulls out the beads, what is the probability that is will be blue?
Mrs.Lunnah has a jar of beads. There are 30 red beads, 30 blue beads and 30 yellow beads. If a student sks her hand in a jar and pulls out the beads, what is the probability that is will be blue?
66,66% or \(\frac{1}{3}\)
◠.◠
there are 27 blue,12 yellow and 42 black marbles in a box.Jack close his eyes and draw a marble from the box.at least how many marble must be put out ensure that there are six ball of the same colour
Để chắc chắn có 6 viên cùng màu phải lấy ít nhật là : 42 + 27 + 6 = 75 viên
thanks, mình cũng vậy nhưng ko biết đúng sai thôi mà
a bag contains green marbles and red marble and red marbles only . If the ratio of the number of green marbles to the number of red marbles is 1:4 then............% of marbles are green
số bút xanh chiếm số % là
1 / (1+4 ) = 0,2 =20%
ĐS
You have 15 blue marbles. Your friend Duong takes away 3 and gives you 2. You drop 8 but pick up 4. Hung takes 4 and gives 5. You take one from Duong and give it to Hung in exchange for 3 more. You give those 3 to Duong and she gives you a blue and a yellow. Phong comes and takes the blue marbles Duong gave you and gives you a green. You give the green to Hung in exchange for a blue marble. Phong then takes a blue marble from Duong, gives it to Hung for a yellow, and gives you the yellow for a blue marble. How many green marbles do you have?
You have 15 blue marbles. Your friend Duong takes away 3 and gives you 2. You drop 8 but pick up 4. Hung takes 4 and gives 5. You take one from Duong and give it to Hung in exchange for 3 more. You give those 3 to Duong and she gives you a blue and a yellow. Phong comes and takes the blue marbles Duong gave you and gives you a green. You give the green to Hung in exchange for a blue marble. Phong then takes a blue marble from Duong, gives it to Hung for a yellow, and gives you the yellow for a blue marble. How many green marbles do you have?
B has 4 blue marbles , 3 yellow marbles and 1 red one in his pocket.
how many marble must be taken out from his pocket before he gets 3 marble of the same colour
cảm ơn các bn
There are 5 blue , 8 green , 9 white and 2 black marbles in the box . At least how many marbles must Darrell draw before he gets the first green one.
A bag contains green marbles and red marbles only. If the ratio of the number of green marbles to the number of red marbles is 1:4 then % of marbles are green.
bản dịch đây
Một túi chứa viên bi xanh và bi đỏ chỉ. Nếu tỷ lệ số lượng viên bi màu xanh lá cây với số lượng viên bi đỏ là 1: 4 thì% của viên bi màu xanh.