# Basic Probability Concepts

All new and solved questions in Basic Probability Concepts category

##### If three dice are rolled, what is the probability of getting a total of 18?
If three dice are rolled, what is the probability of getting a total of 18?...
##### A class contains 5 boys and 6 girls. The teacher is told that 3 of the students can go on a school trip, and selects them at random. What is the probability that 2 boys and 1 girls are selected?
A class contains 5 boys and 6 girls. The teacher is told that 3 of the students can go on a school trip, and selects them at random. What is the probability that 2 boys and 1 girls are selected?...
##### What are independent trials, and how do they relate to the definition of probability?
What are independent trials, and how do they relate to the definition of probability?...
##### What is the probability that the sum of the two dice is greater than or equal to 8?
What is the probability that the sum of the two dice is greater than or equal to 8?...
##### How do you calculate the expected value of a random variable?
How do you calculate the expected value of a random variable?...
##### A box contains 5 red, 2 white, & 3 blue marbles. If a marble is selected at random, what is the probability that it is blue?
A box contains 5 red, 2 white, & 3 blue marbles. If a marble is selected at random, what is the probability that it is blue?...
##### A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that neither will fail?
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that neither will fail?...
##### What is the empirical probability of rolling a sum of 9 with two dice?
What is the empirical probability of rolling a sum of 9 with two dice?...
##### Spinning a wheel, the probability of landing in area A is .99 probability of landing in area B is .01. In 60 spins what is the probability of landing in area B?
Spinning a wheel, the probability of landing in area A is .99 probability of landing in area B is .01. In 60 spins what is the probability of landing in area B?...
##### A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that one or the other will fail?
A certain airplane has two independent alternators to provide electrical power. The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that one or the other will fail?...
##### What is the median of the following numbers?: 16, 9, 10, 5, 4?
What is the median of the following numbers?: 16, 9, 10, 5, 4?...
##### Suppose you roll two die. What is the probability of rolling a seven?
Suppose you roll two die. What is the probability of rolling a seven?...
##### From a well shuffle pack of 52 cards . A card is drawn what is the probabilty that the card is king of daimond?
From a well shuffle pack of 52 cards . A card is drawn what is the probabilty that the card is king of daimond?...
##### What is the probability that a card chosen at random from a standard deck of cards will be a number card?
What is the probability that a card chosen at random from a standard deck of cards will be a number card?...
##### A fair 6-sided die is rolled 4 times. What is the probability of rolling exactly three prime numbers?
A fair 6-sided die is rolled 4 times. What is the probability of rolling exactly three prime numbers?...