744 Answered Questions for the topic Probability & Statistics
11/27/16
The probability of a woman's pregnancy
The probability of a woman's pregnancy will exceed 9 month is 0.314. In 6 human births, what is the probability that the number of births will exceed 9 months is:1. Exactly 32. Exactly 53. At least 5
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Probability & Statistics
11/20/16
Statistics Question
A medication causes headaches as a side effect in 15% of patients who use it. Determine the probability that in a random sample of 20 people exactly 3 patients experience headaches as a side effect.
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Probability & Statistics Probability
11/18/16
whats the appropriate model for the distribution, the mean and the standard deviation?
Pew research reported tht in 2013 78% of all teens had cell phones, we randomly picked 100 teens, let p(hat) represent the proportions of teens in this sample who own a cellphone
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11/16/16
Probability Function
The probability density function f(x) of a continuous random variable X is:
f(x)={ -kx, If -1<x<o
={k, If o≤x<1, where k is a positive constant.
={o, otherwise.
I, Graph...
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Probability & Statistics
11/13/16
Ways to assign nine accounts to three salesmen
How many ways can nine accounts are assigned to three different salesmen so that each one gets three accounts? How many ways if one particular pair of accounts cannot be assigned to the same salesman?
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Probability & Statistics
10/31/16
no. of events of a sample space
in case one outcome is to be selected, there are 2^n events that can be formed of a finite sample space. what if 2 or more than 2 outcomes are selected, how can we determine the no. of all possible...
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Probability & Statistics
10/27/16
Probability and Percent Problem (Please Help ;)
At a certain college, 70% of the students are 21 years of age or younger. 50% of students are female, and 30% of all students are both female and 21 years of age or younger. If one student is...
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10/24/16
Top 10% of the class received an A on the last test...
I don't think I've worked this problem correctly. Please help, thanks!!
A teacher says that the top 10% of the class received an A on the last test. The scores were normally distributed with...
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10/22/16
I draw card x out of a deck of 78 cards. What is the probability that I will draw card x again before my sixth draw?
To clarify, say I draw a card labeled "green" out of a deck of 78 other cards, none of which are the same.
I draw four more times after that, and on my fifth draw, I receive "green" again. What...
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10/19/16
Homework on Probability Question
There is a 85% chance that Josh goes to the mall on Saturday. Otherwise he will go to the movies. Either way, there is a 25% chance that he brings a date.
a.) What is the probability that he...
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10/17/16
Statistics
An urn contains 3 white marbles and 2 black marbles. Two marbles are drawn without replacement. What is the probability that the first marble drawn is white OR the second is black?
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Probability & Statistics
10/17/16
If you bought 10 raffle tickets and a total of 400 were sold, what would be the probability that you won first prize?
Working out too please
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10/16/16
Please, answer with the full solution! Thanks for the help!
Readings on a thermometer are normally distributed with a mean of 0C and a standard deviation of 1.00.What is the probability that a randomly selectedthermometer reads:
• Less than 0.53.• Greater...
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10/15/16
Please, answer with the full solution! Thanks for the help!
Readings on a thermometer are normally distributed with a mean of 0C and a standard deviation of 1.00.What is the probability that a randomly selectedthermometer reads:
• Less than 0.53.• Greater...
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Probability & Statistics
10/14/16
Probability question (Textbook question that does not have an answer in the back)
The Sorry State Lottery requires you to select five different numbers from 0 through 49. (Order is not important.) You are a Big Winner if the five numbers you select agree with those in the...
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10/12/16
A fair coin is flipped 7 times. What is the probability of obtaining at least 1 tail?
Give answer as a decimal number with 3 correct decimal places. Show work!
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10/11/16
5 cards are selected from a fair deck. What is the Probability that they contain at least 4 reds?
5 cards are selected from a fair deck. What is the Probability that they contain at least 4 reds?
Please & Thanks!!
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10/11/16
combinatorics and probability
SEVEN DISTINCT POINTS ARE DRAWN ON A CIRCLE. HOW MANY DIFFERENT TRIANGLES CAN BE DRAWN IN WHICH EACH VERTEX OF THE TRIANGLE IS AT 1 OF THE 7 POINTS?
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Probability & Statistics
10/10/16
Access codes for a lockbox consist of four digits. The fist and last digits cannot be zero. How many different codes are available?
What is the set up and work on how to solve the problem
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10/09/16
A fair coin is flipped 7 times. What is the probability of obtaining at least 1 tail?
A fair coin is flipped 7 times. What is the probability of obtaining at least 1 tail?
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10/09/16
A fair die is thrown 10 times. What is the probability of rolling a 1 on exactly 2 of the 10 throws?
A fair die is thrown 10 times. What is the probability of rolling a 1 on exactly 2 of the 10 throws?
Please help!!
Probability & Statistics
10/09/16
At a local company, the ages of all new employees hired during the last 10 years are normally distributed.
At a local company, the ages of all new employees hired during the last 10 years are normally distributed. The mean age is 38 years old, with a standard deviation of 10 years.
If you were to...
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10/08/16
What is the density function of the current?
For a JFET the V ,i characteristic is parabolic. A simplified model of this is given byi=V2 . In a circuit application the voltage to the JFET is random with a density functionf V (v)=2(1−v) for...
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10/08/16
What is the probability that Chris will get the favorite parking spot on three different days in one week?
Chris arrives at work at the same time all five work days. Chris has a favorite parking spot. Theprobability that Chris will get the favorite parking spot is 70% every day that Chris works.What is...
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10/08/16
Given that the average number of typos per page is 4, what is the probability of 1 typo on a page?
Typing errors or “typos” occur at random on pages in books. The occurrence of these typos areindependent of each other. We can safely assume that the occurrence of typos actually has arather small...
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