788 Answered Questions for the topic Probability & Statistics

Probability & Statistics

05/31/18

In an examination the probability distribution of scores (X) can be approximated by normal distribution with mean 66.2 and standard deviation 9.1.
Suppose one has to obtain at least 55 to pass the exam. What is the probability that a randomly selected student passed the exam?
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Probability & Statistics

05/30/18

Mr. Gle brought a cooler containing drinks to his daughter’s soccer game. There are 15 sports drinks, 5 cans of orange juice, and 3 sodas. If a drink is selecte
 Mr. Gle brought a cooler containing drinks to his daughter’s soccer game. There are 15 sports drinks, 5 cans of orange juice, and 3 sodas. If a drink is selected at random from the cooler, what is... more
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Probability & Statistics

05/25/18

A binomial distribution has 65% rate success. Out of 15 trials, what is the probability of at least 10 being successful?
 A binomial distribution has 65% rate success. Out of 15 trials, what is the probability of at least 10 being successful?
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Probability & Statistics

05/23/18

a hat contains 4 marbles; one red, one blue, one orange, and one green. Two marbles are selected at random without replacement from the hat.
I don’t understand it 
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Probability & Statistics

05/22/18

Probability Question
In a group of 50 boys, 18 own a laptop, 20 own a desktop, and of these 6 own both. What is the probability that a boy picked from this group at random owns either a laptop or a desktop computer,... more
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Probability & Statistics

05/16/18

Is probability of getting an A on a test conditional probability
     Don’t have any
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Probability & Statistics

05/15/18

Fredrick's coins
fredrick has 8 coins in his pocket, consisting of 5 quarters and 3 nickels. If fredrick pulls 2 coins out without replacement, what is the probability that they will both be quarters or they will... more
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Probability & Statistics

05/15/18

the batting order for eight players on a ten person team?
Permutations and cominations
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Probability & Statistics

05/14/18

Probability again
I dont’ quite understand how to go at this one, I feel like ther’s Not enough info in the question!  Any help is greatly appreciated.  According to the U.S. National Center for Health Statistics,... more
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Probability & Statistics

05/14/18

Question on probability
I can’t seem to figure This one out.  I feel like it’s easier than I’m making it out to be.  I’m lost though for sure.   Any help is greatly appreciated.   In a particular neighborhood of 150... more
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Probability & Statistics Statistic

05/14/18

mean = 98.2 standard deviation = 0.62
mean is 98.2. standard deviation is 0.62. if one person is randomly selected, find the probability that the person's body temperature is at least 97 degrees
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Probability & Statistics

05/06/18

in this game what is the probability of dealt Black??
 In a standard deck of 52 playing cards, there are 26 cards that are Black. The remaining cards are Red (notBlack). Consider an experiment where the deck is properly shued and a single card is... more
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Probability & Statistics

05/06/18

What are the expected winnings for a person buying one ticket?
A raffle offers a first prize of $1000, 2 second prizes of $300, and 20 third prizes of $10 each. If 10000 tickets are sold at 25 cents each, find the expected winnings for a person buying 1 ticket
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Probability & Statistics

05/03/18

Find the probability that fewer than 16 are satisfied
A poll reported that 70% of adults were satisified with the job the major airlines were doing. Suppose 20 adults were selected at random and the number who are satisfied are recoreded. What is the... more
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Probability & Statistics Probability Cryptography Probability Problems

04/28/18

Probability of using the same key
A cipher has 365 different keys. Each day, a key is chosen (uniformly) at random from the 365 keys. After how many days is the chance of any key being reused greater than 50%?
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Probability & Statistics

04/25/18

How many choices does the coach have when pick
At a middle school, there are 5 students on the chess team. The coach will pick 2 students to play the next game. How many choices does the coach have when picking the two students?
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Probability & Statistics

04/19/18

What is the probability that a 5 appears at least 2 times if a fair die is rolled 10 times
What is the probability that a 5 appears at least 2 times if a fair die is rolled 10 times
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Probability & Statistics Probability

04/19/18

Probability
There are 3 flavours to choose from, 2 mango, 4 vanilla and 6 cherry. A person picks out three flavours at random, what’s the probability of them picking vanilla 3 times 
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Probability & Statistics Probability Probability Problems

04/12/18

100 Numbered Balls in a Bag
Scenario: I have 100 numbered balls in a bag and number (38) is chosen to be the lucky prize ball. Question: The balls are drawn from the bag one at a time, what is the probability that number 38... more
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Probability & Statistics

04/12/18

Max's parents are told that their newborn son falls at the 95th percentile. How much does Max​ weigh?
need help answering
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Probability & Statistics Probability Probability Problems

04/11/18

Probability help! Die & bag of blocks!
Noreen is playing a game that has a bag containing two wooden blocks where one is yellow the other is green. to play the game she rolls and eight sided die, if a 12367 or 8 is rolled, she blindly... more
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Probability & Statistics

04/11/18

In a residental surburb 60% of all households get internet service from a local cable company, 80% get television from that company and 50% get both services
What is the probability that a randomly selected household subscribes to atleast one of these two services from the local company
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Probability & Statistics

04/10/18

Mary called sun taxi for a ride. The cost of a ride is a fixed cost $4.60 and $2.50 per kilometre. What is the fare for 11 km
i just need help with the question honestly, for a test.
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Probability & Statistics

04/09/18

At a factory that produces pistons for cars, Machine 1 produced satisfactory pistons and unsatisfactory pistons today. Machine 2 produced satisfactory pis
At a factory that produces pistons for cars, Machine 1 produced 392 satisfactory pistons and 98 unsatisfactory pistons today. Machine 2 produced 360 satisfactory pistons and 240 unsatisfactory... more
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Probability & Statistics Probability Word Problem Statistics Question

04/09/18

Probability question for Stats class help.
Suppose that we have  15 marbles in a jar. 7 of them are green, 2 of them are blue, and the rest are red. 1)What is the probability that the first marble we draw is blue?2)Suppose you drew a blue... more
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