Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 94879: A bag contains 3 purple marble and 7 blue. Each marble selected is not put back into the bag before the next marble is selected. Find the probability of selecting a blue marble then a purple marble.
Click here to see answer by edjones(7569)   |
Question 94936:
One urn contains 3 red and 7 white marbles. A second urn contains 2 red and 8 white marbles. One urn is selected and a ball drawn. The probability of selecting the first urn is 0.4 and the probability of selecting the second is 0.6. If a white ball is drawn, find the probability it came from the second urn.
Click here to see answer by edjones(7569) |
Question 95587: I am trying to help my grandson with his Algebra homework. I guess I have forgotten much of what I knew at one time. I appreciate any help you can give me on this problem.
Suppose that a dart lands at random on the dartboard shown at the right. Find each theoretical probablility.
17. The dart lands in the bull's eye
18. The dart lands in a green region
19. The dart scores at least 10 points
20. The dart scores less than 10 points.
The dart board shows: r= 1.5 in Width of each ring = 1.5 in.
Bulls eye is 20 points, next ring is 10 points, next 5 points, outside ring 2 points.
Thank you so much.
Click here to see answer by stanbon(57307) |
Question 95603: Recidivism. In May 2003 issue of Scientific American, R. Doyle examined rehabilitation of felons in the article, "Reducing Crime: Rehabilitation is making a Comeback".
One aspect of the article discussed recidivism of juvenile prisoners between 14 and 17 years old, indicating the 82% of those released in 1994 were rearrested within 3 years. Assuming that recidivism rate still applies today, solve the following problems for six newly released juvinelle prisoners between 14 and 17 years old.
A. Determine the probability that the number rearrested within 3 years will be exacly four; at least four;at most five; between two and five; inclusive?
B. Determine the probability distribution of the random variable Y, the number of released prisoners of the six who are arrested within 3 years.
C. Determine and interpret the mean of the random variable Y.
D. Obtain the standard deviation of Y.
E. If in fact, exactly two of the six released are rearrested within 3 years, would you be inclined to conclude that recidivism rate today has decreased from the 82% rate in 1994? Explain your reasoning.
Click here to see answer by stanbon(57307) |
Question 95887: Find the mean,median,mode of each data set. Give answers to the nearest thousandth,when necessary.
1,3,4,8,1,7,1,5
This is what I have tried so far and I dont know if its right. 1,3,4,8,1,7,1,5=30/8=3 mean=3,median=8,mode=1
Click here to see answer by tutorcecilia(2152)  |
Question 97762: Chapter 5: A Survey of Probability ConceptsISBN : 0072868244 Author : Douglas A. Lind, William G. Marchal, Samuel A. Wathen
copyright © 2004 The McGraw-Hill Companies
exercise 42;
A telephone number consists of seven digits, the first three representing the exchange. How many different telephone numbers are possible within the 537 exchange.
Click here to see answer by ManMan(1) |
Question 97762: Chapter 5: A Survey of Probability ConceptsISBN : 0072868244 Author : Douglas A. Lind, William G. Marchal, Samuel A. Wathen
copyright © 2004 The McGraw-Hill Companies
exercise 42;
A telephone number consists of seven digits, the first three representing the exchange. How many different telephone numbers are possible within the 537 exchange.
Click here to see answer by mathslover(135) |
Question 97958: An run contains 8 red, 3 white and 9 blue balls if 3 balls are drawn at random, determine the probability that (a)all 3 are red (b) all 3 are white (c) 2 are red and 1 is blue (d) atleast one is white (e) 1 of each colour is drawn (f) the balls are drawn in the order, red, white, blue.
thanks
Click here to see answer by stanbon(57307) |
Question 98094: In his pocket Pat has 5 dimes, 7 nickels, and 4 pennies. He selects 4 coins.
a.)How many ways can he select 4 dimes?
b.)How many ways can he select 4 pennies?
c.) How many ways can he select 3 nickels and one dime?
d.) How many ways can he select exactly 3 nickels?
i tried to use the combination of all the possibilities and do that for the first few (a, b, and d), but I wasn't sure if that was right. Really if I can just get the letter c I can probably get the rest of them okay.
Click here to see answer by stanbon(57307) |
Question 98082: How many different 9 player baseball teams can be formed from 15 players if 3 only pitch while the remaining 12 can play any of the 8 remaining positions?
I really do not have a clue how to solve. I tried to use different types of combination things that i had learned in class, but it has too many variables for it.
Click here to see answer by stanbon(57307) |
Question 98082: How many different 9 player baseball teams can be formed from 15 players if 3 only pitch while the remaining 12 can play any of the 8 remaining positions?
I really do not have a clue how to solve. I tried to use different types of combination things that i had learned in class, but it has too many variables for it.
Click here to see answer by mathslover(135) |
Question 98283: You have ten stacks of coins, each stack consisting of ten half-dollars. One entire stack is counterfeit, but you do not know which one. But you do know the weight of a genuine half-dollar (10 grams each), and you are also told that each counterfeit coin weighs 1 gram more than it should. You may weigh the coins on a scale. What is the smallest number of weighings necessary to determine which stack is counterfeit?
Click here to see answer by checkley71(8403) |
Question 98231: Using the following table:
Clothing Orders: 137 In Stock 23 On Backorder
Other Orders: 56 In Stock 14 On Backorder
Question:
Find the probability that a randomly selected CLOTHING order is on backorder.
My attempt:
Would I simply take 23 and divide it by the total number of clothing orders (137+23=160)? Answer .143
Thanks Jim
Click here to see answer by stanbon(57307) |
Question 98165: If 20% of the residents in Washington prefer a white telephone over any other color available,
what is the probability that among the next 1000 telephone installed in the city
i) between 170 and 185 inclusive will be white
ii) at least 210 but not more than 225 will be white
Click here to see answer by stanbon(57307) |
Question 98323: An urban community would like to show that the incidence of breast cancer is higher than in a nearby rural area. If it is found that 20 of 200 adult women in the urban community have breast cancer and 10 of 150 adult women in the rural community have breast cancer, can we conclude at the 0.05 level of significance that breast cancer is more prevalent in the urban community?
Click here to see answer by stanbon(57307) |
Question 98621: QUESTION: There are 8 red, 3 blue, and 12 black marbles in a bag. If 3 are selected, what is the probability that all are red or all are blue?
WHAT I HAVE:
8/23 * 7/22 * 6/21 + 3/23 * 2/22 *1/21 = 336/10626 + 6/10626 = 57/1771
Click here to see answer by Nate(3500) |
Question 99452: Please help me solve the following problem
(8 candies are in a jar. 5 are cherry and 3 are grape. A candy is drawn at random and replaced with one of another flavor. What are the chances of drawing our a cherry.)
_______________________________________________________________________
5/8=.625 or 63% ???
Click here to see answer by scottnascar(12) |
Question 98164: An oil drilling company ventures into various locations, and their success or failure is
independent from one location to another. Suppose the probability of a success at any
specific location is 0.25.
i) What is the probability that a driller drills 10 locations and finds 1 success?
ii) The driller feels that he will go bankrupt if he drills 10 times before the first
success occurs. What are the driller’s prospects for bankruptcy?
Click here to see answer by stanbon(57307) |
Question 99848: We are having difficulty solving this problem and we need to show the equation: A bag contains gree and yellow color tiles. You pick 2 at random without replacing the first. The probability the first time is yellow is 3/5. The probability of drawing 2 yellow tiles is 12/35. Find the probability the second tile is yellow.
Click here to see answer by stanbon(57307) |
Question 99847: We cannot get the correct answer to this probability question: A bag contains red & blue marbles. you pick 2 marbles at random without replacing the first one. The probability of drawing a blue and then a red is 4/15. The probability that your second marble is red if your first is blue is 2/3. Find the probability the first marble is blue.
Click here to see answer by edjones(7569) |
Question 99847: We cannot get the correct answer to this probability question: A bag contains red & blue marbles. you pick 2 marbles at random without replacing the first one. The probability of drawing a blue and then a red is 4/15. The probability that your second marble is red if your first is blue is 2/3. Find the probability the first marble is blue.
Click here to see answer by stanbon(57307) |
Question 100264: A sea turtle buries 90 eggs in the sand. From the 50 eggs that hatch, 37 turtles do not make it to the ocean. What is the probability that an egg chosen at random hatched and the baby turtle made it to the ocean?
Help please!
Click here to see answer by edjones(7569) |
Question 99789: If i drive through 3 sets of traffic lights and the probablity of any one being green is 0.3 and the probability of one not being green is 0.7 how do i find what the probability of all being green and the probability that at least one light will not be green? Also how do i calculate the theoretical probability that all three sets of lights will be green.
Click here to see answer by stanbon(57307) |
Question 99790: a Bank has 2 tellers. customers arriving at the bank vary between 1 and 6 per minute. Each teller services 1 person per minute. What is the length of the waiting line after 5 minutes?
How long will a customer wait if they arrive on the 10th minute
How many times will the waiting time be reduced to zero
What is the average number of people waiting in line over the 20mins
Click here to see answer by stanbon(57307) |
Question 101851: I cannot figure the correct term terms to use. Help please.
During the winter months, Mr Myer experiences diffuculty in staring his 2 cars, a 1966 Mustang and a 1986 Ranger. The probability that the Mustang starts in 0.8, and the probablity the Ranger starts is .4. The probability that both cars start is 0.3. Let A represent the event "The Mustang starts, and B represent "The Ranger Starts". Use probability notation to describe and solve the following:
a. What is the probability that Mr Myer can start at least one of his cars?
b. What is the probability that Mr Myer cannot start either of his cars?
Wow it seems like a lot to. Should I start with a joint probability table?
I can say A is Mustang Starts=.8 So A' prime will be .2? To equal 1
I can say B is Ranger Starts=.4 So B' prime will be .6? To equal 1
What do I do with the both cars start information? Which is 0.3. Would I need a C and a C' prime? How do I write this probability notation?
Thank you for your assistance.
Click here to see answer by stanbon(57307) |
Question 101848: I cannot figure the correct term terms to use. Help please.
During the winter months, Mr Myer experiences diffuculty in staring his 2 cars, a 1966 Mustang and a 1986 Ranger. The probability that the Mustang starts in 0.8, and the probablity the Ranger starts is .4. The probability that both cars start is 0.3. Let A represent the event "The Mustang starts, and B represent "The Ranger Starts". Use probability notation to describe and solve the following:
a. What is the probability that Mr Myer can start at least one of his cars?
b. What is the probability that Mr Myer cannot start either of his cars?
Wow it seems like a lot to. Should I start with a joint probability table?
I can say A is Mustang Starts=.8 So A' prime will be .2? To equal 1
I can say B is Ranger Starts=.4 So B' prime will be .6? To equal 1
What do I do with the both cars start information? Which is 0.3. Would I need a C and a C' prime? How do I write this probability notation?
Thank you for your assistance.
Click here to see answer by edjones(7569) |
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