There is insufficient information in the question to properly answer it. You did not specify how many places and how many 3's there are on the spinner, and you did not specify the set from which you could pick an "a", both of which are necessary pieces of information to calculate probability. Please restate the question.
The probability of picking 5+3 = 8 students is 0.1202
The probability of spinning the number 3, or any number, is 1/4 or 0.25 since there is 4 numbers total.
1/3
3/7
Its 16.667% or 16 1/3%
The theoretical probability of randomly picking each color marble is the number of color marbles you have for each color, divided by the total number of marbles. For example, the probability of selecting a red marble is 3/20.
The probability of picking a distinct set of 3 numbers from 20 is1/[20!/(3!)(17!)]= 1/1140The probability of only picking 3 from 20 is1/20
1/3
The probability of picking 5+3 = 8 students is 0.1202
The probability of spinning the number 3, or any number, is 1/4 or 0.25 since there is 4 numbers total.
1/3
3/7
Its 16.667% or 16 1/3%
The experimental probability of anything cannot be answered without doing it, because that is what experimental probability is - the probability that results from conducting an experiment, a posteri. This is different than theoretical probability, which can be computed a priori. For instance, the theoretical probability of rolling a 3 is 1 in 6, or about 0.1667, but the experimental probability changes every time you run the experiment
3/10 or 0.3 is the probability of picking a purple marble.
Assuming that the four-sided spinner is fair and that it is numbered in the traditional way of 1, 2, 3 and 4, the probability of spinning a three is 1/4.
3 out of 13