问答题
Simple Probability and Outcomes
These questions will test your knowledge of operations involving simple probability and outcomes.
Answer the following questions.
These questions will test your knowledge of operations involving simple probability and outcomes.
Answer the following questions.
问答题
| If you roll a single 6-sided die, what is the probability that you will roll an odd number? |
【正确答案】
【答案解析】On a 6-sided die, there are 3 even numbers, and 3 odd numbers. Therefore, the probability that you will roll an odd number is 3 out of 6, or . This can be reduced to 
. This can be reduced to
问答题
| A company knows that 2.5% of the CD players it makes are defective. If the company produces 300,000 CD players, how many will be defective? |
【正确答案】
【答案解析】If 2.5% of the CD players produced by this company are defective, then the number of defective devices out of 300,000 can be determined by multiplication, as follows:
0.025×300,000=7,500
问答题
| When flipping a coin, what is the probability that it will land on tails four times in a row? |
【正确答案】
【答案解析】When flipping a coin, there are only two possible outcomes: heads or tails. Therefore, each side has a probability of , or 0.5, of landing facing up. The chances of the coin landing on tails four times in a row can be expressed as
, or 0.5, of landing facing up. The chances of the coin landing on tails four times in a row can be expressed as
问答题
| If the probability that Dave will go to class is 0.7, what is the probability that he will not go to class? |
【正确答案】
【答案解析】The probability that Dave will go to class is 0.7, or 70%. Therefore, the probability that he will NOT go to class is 100%-70%, or 30%, which is equivalent to 0.3, so either answer will be correct.
问答题
| A bowl contains 20 marbles (8 blue, 6 red, 3 green, 2 yellow, and 1 orange). If you reach in and choose one marble at random, what is the probability that it will be red? |
【正确答案】
【答案解析】There is a total of 20 marbles in the bowl, 6 of which are red. If one marble is selected at random, the probability that it will be red is This can be reduced to 
This can be reduced to