813 Answered Questions for the topic Probability & Statistics

Probability & Statistics

03/30/16

4 simple probability questions
1 . Approximately 72% of the students in this class make less than $20,000 a year. If 7 students are randomly selected, find the probability that more than 3 students make less than $20,000 a... more
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Probability & Statistics Probability

03/28/16

help with this probability question.
A refrigerator contains 6 apples, 5 oranges, 10 bananas, 3 pears, 7 peaches, 11 plums, and 2 mangos. Imagine you stick your hand in this refrigerator and pull out a piece of fruit at random. What... more
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Probability & Statistics Probability

03/28/16

help with a question
A jar contains 10 blue marbles, 5 red marbles, 4 green marbles, and 1 yellow marble. Two marbles are chosen (without replacement). (a) What is the probability that one will be green and the other... more
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Probability & Statistics Probability Problems

03/28/16

did i solve this correctly?
You can flip a coin three times. a) what is the probability of getting heads on only one of your flips? b) what is the probability of getting heads on at least one flip?   So this is how i got... more
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Probability & Statistics

03/28/16

This is my first time taking college statistics and I'm stuck and confused. Please explain step by step for me to understand.
A=event the card selected is the king of hearts B=event the card selected is a king C=event the card selected is a heart, and D=event the card selected is a face card   outcomes for each four... more
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Probability & Statistics Probability Math Help Math Word Problem

03/28/16

Conditional Probability & The Multiplication Rule
68% of the citizens approve of a governor. Only 47% of the citizens approve of both the governor and the lieutenant governor. If a randomly selected citizen approves of the governor, what is the... more
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Probability & Statistics Probability Stats Probability Problems

03/27/16

Probability Question
X has the following pdf   x       p(x) -----|-------  10  |0.40  15  |0.15  17  |0.20  21  |0.15  22  |0.10   a)What is the moment generating function for X b)Use your Moment Generating... more
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Probability & Statistics Probability Stats Probability Problems

03/27/16

Probability Question
According to an airline report roughly 1 piece of luggage out of every 200 that are checked are lost. Suppose that a frequently flying businesswoman will be checking 120 bags over the course of the... more
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Probability & Statistics Probability Math Help Math Word Problem

03/27/16

Conditional Probability & The Multiplication Rule
If the probability of winning a carnival game is 3/7 and you play the game two times, what is the probability that you will win both times or you will lose both times?
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Probability & Statistics Probability Math Help Conditional Probability

03/27/16

Conditional Probability Multiplication Rule Help
68% of the citizens approve of a governor. Only 47% of the citizens approve of both the governor and the lieutenant governor. If a randomly selected citizen approves of the governor, what is the... more
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Probability & Statistics Statistics

03/24/16

Probability
QUESTION 2 (25)2.1. A small town is served by three airline companies, X, Y and Z. From airport records, it is known that 45% of flights are provided by X, 35% of flights are provided by Y, while... more
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Probability & Statistics Probability Stats Probability Problems

03/23/16

Probability Question
A company has 27 employes. A committee of 4 will be selected. The probability that exactly one woman is selected for the committee is two times the probability that no woman are selected. Calculate... more
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Probability & Statistics Probability Math Help Conditional Probability

03/23/16

Conditional Probability Multiplication Rule Help
Suppose three cards are drawn at random from a standard deck. What is the probability they are all face cards?
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Probability & Statistics Probability Math Help Conditional Probability

03/23/16

Conditional Probability & The Multiplication Rule Help!
A card is drawn at random from a deck. What's the probability that it is a jack given that it is a face card?
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Probability & Statistics

03/22/16

Vos savant math problem
Vos savant math problem, why would choosing to switch from door 1 to door 2 be better? In that specific scenario wouldnt it be 50/50 because of the host reveals a goat in door 3 then that means the... more
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Probability & Statistics Probability Probability Problems

03/21/16

Probability statistics and two tailed test
A tomato farmer with a very large farm of approximately 2200 acres had heard about a new type of rather expensive fertilizer which would supposedly significantly increase his production. The frugal... more
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Probability & Statistics Standard Deviation

03/20/16

standard deviation find the probability that more than 30%
A manufacturer produces a certain type of components that has a length of 2.1 cm. the distribution of this components is normal with mean 2.15 cm and sd 0.4cm. There are 50 pieces in a bag. Find... more
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Probability & Statistics Statistics Probability Math Help

03/20/16

Math Homework Help!! Permutations, Combinations,Counting Techniques
There are 10 puppies. 6 are male, 4 are female. If you pick 3 puppies at random, what is the probability they will all be the same gender?
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Probability & Statistics

03/16/16

.His class had 30 students.To save time,he asked 10 boys the brand of sneakers that they were wearing..This was NOT a random sample.STATE ONE REASON WHY
write in a coplete sentence  
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Probability & Statistics

03/14/16

What is the number of possible outcomes if three quarters are tossed and the total numbers of heads and tails are counted?
A) 2 B) 4 C) 6 D) 8
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Probability & Statistics

03/14/16

If the probability of rain on any given day is .2 what is the probability that it will rain 2 days in a week?
If the probability of rain on any given day is .2 what is the probability that it will rain 2 days in a week?
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Probability & Statistics

03/09/16

True or False
In the classical approach to finding probabilities, we place the number of successes over the total possible. To find the total possible, we use counting methods such as factorials, permutations,... more
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Probability & Statistics

03/07/16

Suppose you tossed a die six times. What is the probability of getting exactly three fours
Probability 
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Probability & Statistics Probability

03/04/16

probability question
Probability of stopping at first traffic light is 0.7 and the probability of stopping at 2nd traffic light is 0.4. what is the probability of stopping at a)both light b) none of the traffic light   more
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Probability & Statistics

03/03/16

Can anyone help me
Find p(a and b) if p(a) = 0.8 p(a|b)=0.3 and p(b|a) =0.1 
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