4/11
To work out probability you have to know the number of possible options, and how many of those options meet the criteria. In this case there are 26 possible options (all the letters) and 21 that meet the criteria (21 non-vowels). The probability is the number that match divided by the total number possible. In this case it would be 21/26. This comes out to approximately 0.80769. Thus the probability that a letter picked at random is not a vowel is 0.80769
the letter a
The answer depends on how many cards are picked, whether they are picked at random, from what sort of pack, and whether or not cards are replaced before the next one is picked. The probability that a single card, picked at random from a regular 52 card deck is red, is 0.5
If the winning numbers are picked at random, the probability is 1 in 169911.
What is the probability that the letter P is picked when a letter is picked at random from the word STUPID!
If a student is picked at random what is the probability that he/she received an A on his/her fina?
The probability that a date picked at random is February 30th is zero, as there is no February 30th, even in leap years.
4/11
If only one person is picked at random then the probability is 1/16 = 0.0625
To work out probability you have to know the number of possible options, and how many of those options meet the criteria. In this case there are 26 possible options (all the letters) and 21 that meet the criteria (21 non-vowels). The probability is the number that match divided by the total number possible. In this case it would be 21/26. This comes out to approximately 0.80769. Thus the probability that a letter picked at random is not a vowel is 0.80769
the letter a
There are 4 months that end in the letter Y, January, February, May, and July. The probability, then, of a random month ending in the letter Y is 4 in 12, or 1 in 3, or about 0.3333.
If picked at random, the answer is 2/11.
The answer depends on how many cards are picked, whether they are picked at random, from what sort of pack, and whether or not cards are replaced before the next one is picked. The probability that a single card, picked at random from a regular 52 card deck is red, is 0.5
If the winning numbers are picked at random, the probability is 1 in 169911.
For a single card, picked at random from a well shuffled normal pack the probability is 3/13.