# math

posted by .

how do u find probability?

• math -

By looking under random rocks?

Seriously, probabality is the ratio of the number of possible successes divided by the number of total possibilities.

At a dance, there are 13 boys, and 3 girls.

The probability of a male female couple is
3/16 * 13/15 Notice in each instance of fraction, it is the number of successes available divided by the number total. In the second fraction, the number total has decreased one, because a girl is removed.

There are are many ways to "do" probabllity, depending on what is given.

See:

http://en.wikipedia.org/wiki/Probability

## Similar Questions

1. ### math probability

this is a probability question... Suppose you are asked to choose a whole number between 1 and 13 inclusive. (a) what is the probability that it is odd?
2. ### statistics

Find the indicated binomial probabilities. Round to the nearest 3 decimal places. In a local college, 20% of the math majors are women. Ten math majors are chosen at random. 1) What is the probability that exactly 2 are women?
3. ### statistics

Let a random variable be distributed as shown below X=x : 0,1,2,3,4,5,6 P(x): .1 .09 .2 .15 .16 .2 (a) Find the probability p(6) (b) Find the probability P(3< X < 5) (c) Find the probability P(X < 4) (d) Find the probability …
4. ### math

Emily surmises that the probability that she will pass math or chemistry is .95, the probability of her passing math is .7, and the probability of passing both is .55. Find her estimate of the probability of passing chemistry?
5. ### Math

Alberto figures that the probability of his hockey team winning on saturday is 65%. Alvin figures that the probability of his basketball team winning on saturday is 70%. Assume that the events are independent and that the boys estimates …
6. ### Math Probability

If the probability that event A will happen is 1/4 and the probability of A not happening is 3/4, find the probability that event A happens 3 times out of 7 experiments
7. ### stat

Three coins are tossed, and the number of heads observed is recorded. (Give your answers as fractions.) (a) Find the probability for 0 heads. (b) Find the probability for 1 head. (c) Find the probability for 2 heads. (d) Find the probability …
8. ### Statistics

Event A occurs with probability 0.1 and event B with probability 0.5 A) What is the maximum probability that the intersection of A and B can have?
9. ### Math

A number cube is rolled 100 times. The results are shown in the table below. Outcome: 1, 2, 3, 4, 5, 6. Number of times rolled: 22, 18, 9, 11, 19, 21. Find the experimental probability and express it as a percent. P(even) = ?
10. ### Math

A number cube is rolled 100 times. The results are shown in the table below. Outcome: 1, 2, 3, 4, 5, 6. Number of times rolled: 22, 18, 9, 11, 19, 21. Find the experimental probability and express it as a percent. P(even) = ?

More Similar Questions