788 Answered Questions for the topic Probability & Statistics
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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10/08/16
What is the probability that given the motorist arrived when the light was red that the motorist will need to wait more than 20 seconds?
In Tinytown there is one traffic signal with two states green and red. The signal is located at theonly intersecting streets in Tinytown. The traffic light is green for 90 seconds and then red...
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10/05/16
Find the probability that a person whose result is positive is actually negative
The Centers for Disease Control (CDC) estimates that 0.6% of Americans have AIDS. The HIV-1 tests correctly diagnose the presence of HIV in 95% of the persons who have it and correctly diagnose its...
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10/05/16
If 15% of adult females smoke..
An ectopic pregnancy is one where gestation occurs outside the uterus. The condition is twice as likely for a female who smokes than for one who is a nonsmoker. If 15% of Adult females smoke, what...
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Probability & Statistics
10/05/16
Pricing and inventory
A retail shop sells 500 pairs of shoes each year. Each pair of shoes is priced at $50. Suppose that the shop can get each pair of shoes from their supplier at $20 and the ordering cost, regardless...
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10/03/16
Unfair coin, probability of selecting a girl?
An unfair coin with Pr[H]=0.2 is flipped. If the flip results in heads, a student is selected at random from a class of 12 boys and 10 girls. Otherwise, a student from a different class containing...
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09/28/16
Three marbles are drawn randomly WITH REPLACEMENT
Three marbles are drawn randomly WITH REPLACEMENT from a box with 5 blue and 7green marbles.(a) What is the probability that all the marbles drawn are green?(b) What is the probability that 2 of...
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