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Probability

The probability of a certain event is a number expressing the likelihood that a specific event will occur, expressed as the ratio of the number of actual occurrences to the number of possible occurrences. In mathematics, it is a measure of how often an event will happen and is the basis of statistics.

14,643 Questions

What is the probability of rolling a 5 or getting tails?

Your question is very vague but if we assume "rolling a 5" is rolling a five on a six sided dice then the probability of that would be 1/6 since there are 6 sides and 5 is just 1 side.

Again your question is very vague but if we assume "getting tails" means getting heads or tails on a 2 sided coin then the probability of that would be 1/2 since there are 2 sides and tails is just 1 side.

What is the probability of not being dealt a queen in a 52 card deck?

The answer will depend on the exact situation.If you are dealt a single card, the probability of that single card not being a queen is 12/13 - assuming you have no knowledge about the other cards.Here is another example. If you already hold three queens in your hand (and no other cards have been dealt), the probability of the next card being dealt being a queen is 1/49, so the probability of NOT getting a queen is 48/49 - higher than in the previous example.

How many black face cards are in a deck of 52 cards?

In a standard deck of 52 cards black face cards are the spades and claver.

There are 13 spade and 13 claver cards ( A,2,3,4,5,6,7,8,9,K,Q,J)

So there are a total of 26 black face cards in a deck of 52 cards.

Probability of rain on monday is what is the probability of no rain on Monday?

IF probability of rain is X percent then probability of no rain is 100- X percent. For example if prob of rain is 80% prob of no rain is 20%

Why do smaller populations need larger sample sizes?

They do not. Population size does not affect the sample size. The variability of the characteristic that you are trying to measure and the required accuracy will determine the appropriate sample size.

What are the chances that a card drawn from a standard deck will be a club or a diamond?

In a standard deck of 52 cards, there are 13 clubs and 13 diamonds. Therefore, the total number of favorable outcomes is 26 (13 clubs + 13 diamonds). The probability of drawing a club or a diamond is calculated by dividing the number of favorable outcomes by the total number of possible outcomes, which is 52. So, the chances of drawing a club or a diamond from a standard deck is 26/52 or 1/2, which simplifies to 50%.

How many outcomes can I have rolling a die 5 times?

Since you are not looking for any one number, you will get 5 outcomes.

What is the event space for rolling a number greater than 3 with one die?

For a regular number die, the event space is {1, 2, 3, 4, 5, 6}.

Will Random sample always accurately predict the outcomes of an entire population?

No. Only a census can ACCURATELY predict the outcomes: a random sample cannot.

How many 9 of spades in in a 52 pack of playing cards?

There is only one nine of spades in a standard deck of cards, so in probability, that would be 1/52

What is the probability of drawing a king or drawing a heart?

There are a total of 4 kings, and a total of 13 hearts; from that, you must subtract 1, since otherwise you would count the king of hearts double. Thus, in a pack of 52 cards, your probability is (4 + 13 - 1) / 52, or 16/52.

If you throw a die 12 times how many times would you land a 6?

The odds are that you will throw a 6 twice if you roll a die 12 times.

What is the probability to take a Jack in 52 cards?

1:13

or 4:52

as four suits and one jack in each suit

What is the probabilty of drawing a face card that has a diamond?

3/52

Assuming you're randomly drawing from a usual deck 52 unique cards. Jack Queen King are the face cards.