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Given eight students four of which are females if two students are selected at random without replacement what is the probability that both students are female?
The probability of selecting 1 female at random is 4/8 There are now 7 students, 3 of which are female so the probability of selecting another female is 3/7 The probability two randomly selected students are female is (4/8)x(3/7)= 3/14
There are 10 rolls of film in a box and 3 are defective Two rolls are selected without replacement What is the probability of selecting a defective roll followed by another defective roll?
1/15 or about 0.07
A bag contains 2 yellow 12 red and 6 green marbles What is the probability of selecting a red marble replacing it then selecting another red marble?
The probability of drawing two reds, with replacement, is the same as the probability of drawing a red, times itself. So: P(drawing two reds) = P(drawing a red)2 = (12/(2 + 12 + 6))2 = (12/20)2 = (3/5)2 = 9/25
10 cards are numbered from 1 to 10 and placed in a box One card is selected at random and is not replaced Another card is randomly selected What is the probability of selecting two prime numbers?
Primes are 2, 3, 5 and 7 which form 6 "prime pairs". There are 45 possible pairs in the box so the odds are 39 to 6 against ie 13/2, a probability of two-fifteenths or 13.3% or 0.13 recurring.
What is the probability that one randomly-selected person in America will know another randomly-selected person in America?
There is not enough information about the the distribution of the number of people known by each individual - nor the averages. It is therefore no possible to give an answer any more precise than "the probability will be infinitesimally small".
When an event's probability depends on the likelihood of another event. the probability is what?
It is dependent.
What is another name for Experimental Probability?
Another name for experimental probability is empirical probability. This is the ratio of the number of outcomes in which a specified event occurs to the total number of trials.
If a box contains 4 red marbles seven white and 5 blue and two marbles are drawn one at a time with replacement What is the probability that both marbles are white?
Since the box contains 16 marbles, seven of them white, then the probability of drawing one white marble is 7/16. If you replace the marble and draw again, the probability of drawing another white marble is still 7/16. The net probability of drawing two white marbles, while replacing the first, is 49/256.
What is chance in maths?
Another word for probability.
What is the definition of an event that has a probability of 1?
It's the probability that I will take another breath of air, or the probability that tomorrow will come, or the probability that the moon will go through all its phases for the next month.
A box contains 3 yellow 2 blue and 4 red pencils suppose you choose a pencil replace then choose another Find the probability of choosing yellow then red?
4/27
Another word for Selected by ballot?
elected
