744 Answered Questions for the topic Probability & Statistics
04/18/16
Probability
In a b olt factory 30%, 50% and 20% of pro duction is done on machine s I, I I and I I Iresp ectively. It is known that 4%, 3% and 5% of the output of these resp ective machinesis defective.(a)...
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04/15/16
A game involves rolling a fair six-sided die. If the number facing upward on the die is a whole number multiple of three, the player wins an amount equal to the
A game involves rolling a fair six-sided die. If the number facing upward on the die is a whole number multiple of three, the player wins an amount equal to the number on the die times $20. If the...
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04/14/16
Venn diagrams
The company is conducting a survey to determine the spread of two strains of viruses (type A and type B) in a certain wing of a hospital. Out of 450 patients, 267 tested positive to virus A253...
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Probability & Statistics
04/13/16
A random sample of 420 new Ford trucks showed that 105 required repairs within the first warranty year.
What is the estimate for the probability that a new Ford truck will need repairs within the first warranty year?
Select one:
a. 105b. 0.75c. 315d. 0.25
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Probability & Statistics
04/13/16
In a club there are 10 women and 7 men.
In a club there are 10 women and 7 men. A committee of 6 women and 4 men is to be chosen. How many different possibilities are there?
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04/11/16
probability / statistics question?
say that you were taking a multiple choice test and the teacher says you only have 30 seconds left. however, you have 5 questions left that you haven't answered. you have no time to even look at...
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04/11/16
Probability Question
We have a CDF
{0 if y< 0
F(y) = {Y^4 if 0<= y <= 1
{ 1 if y>1
The Z transformation is:
Z = 3Y^2 + 2,2 ≤ z ≤ 5
My question is: I dont...
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Probability & Statistics
04/04/16
Probability & Statistics
1. A family has n > 0 children with probability αp^n, where α≤p/(1-p). (a) What is the probability that the family has no children? (b) If each child is equally likely to be a boy or a girl...
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Probability & Statistics Probability Problems
04/04/16
Twenty-five percent of Americans are college graduates. You survey a random sample of fifteen Americans.
What is the probability that: a. Exactly three of them are college graduates? b. Between two and five (inclusive) of them are college graduates? c. More than seven of them are college graduates?
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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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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...
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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...
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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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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...
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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...
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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...
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