Probability

2010020103

Level: 
A
Two dice are thrown at the same time. Which of the following statements is true?
The probability that we get the sum 9 is the same as the probability that we obtain the sum 5.
The probability that we get the sum 9 is two times greater than the probability that we obtain the sum 5.
The probability that we get the sum 9 is the highest possible.
None of the above is true.

2010013606

Level: 
A
In a set of 200 items, 20 are defective. We pick randomly 10 items from this set. First nine items were not defective. Find the probability that the tenth item selected is not defective too. Results are rounded to three decimal places.
171191≐0.895
180191≐0.942
180200≐0.9
1171≐0.006

2010013605

Level: 
A
The wooden cube with the edges of length 4cm has faces painted in blue. Suppose we cut the cube into small unit cubes (the edge length is 1cm) and select one of the unit cubes at random. What is the probability that the selected cube has at most one face painted in blue?
0.5
0.375
0.438
0.75