Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 115364: I am having a really difficult time with this problem - it is not in a book it is homework and I am lost.
The probability that a life insurance salesperson following up a magazine lead will make a sale is 30%. A salesperson has two leads on a certain day. What is the probability that the salesperson will sell (i) both? (ii) exactly one policy; (iii) at least one policy?
Click here to see answer by stanbon(26259)   |
Question 115344: I need help with this PLEASE!!!!
I can't figure out how to do this in formula
A can company reports that the number of machine breakdown in an eight hour shift has a mean of 1.5. Find the probability that there will be (i) exactly 2 breakdowns; (ii) fewer than 2 breakdowns; (iii) no breakdowns in 3 consecutive shifts.
Click here to see answer by stanbon(26259) |
Question 114283: I could really use some help with this. I have no idea where to start
A scientist was hired to determine which brand of toothpaste is more effective in preventing cavities in children. Thirty children volunteered to participate in the experiment from which the scientist randomly created two groups of 15 children. The first group was given Brand A toothpaste, and the second group was given Brand B toothpaste. All of the children were given detailed directions describing when and how they should brush their teeth. After six months the children were taken to the same dentist and the number of cavities each child had was recorded. This data was used to determine which toothpaste is more effective.
Task:
A. Identify something the scientist tried to control in this experiment. Identify something the scientist did not consider controlling or was unable to control in this experiment and explain the adverse effects this might have had on the collected data.
B. Explain how replication was used in this experiment and why it is important.
C. The scientist randomly created the two groups. Instead, the scientist could have created the two groups based on some common characteristic, such as age or gender. Explain the adverse effects this might have had on this experiment.
D. Explain the role comparison plays in experiments and specify what was compared in this experiment.
Click here to see answer by depompeigirl(3) |
Question 115381: This is homework and I have tried I keep coming up with 35 as the answer but different formulas each time......can someone show me the way with this one I am pulling my hair out
I= 50% II= 40% EXACTLY III= 35% = this is what I come up with and I do not think this is right because of the formula...statistics has formulas and this isn't one of them
This is the problem:
There are 20 questions in a multiple-choice test. Each question has five
choices and one correct answer out of these five choices. A student did not study. He/she answers the questions at random. What are the probability that he/she makes (i) more than 10 answer right? (ii) exactly eight right? (iii) at most 7 right?
Click here to see answer by stanbon(26259) |
Question 114795: A student takes a quiz consisting of 5 multiple choice questions. Each question has 4 possible answers. If a student is guessing the answers at random, and the answers to different questions are independent,
A. Find the probability of giving 5 correct answers.
B. Find the probability of giving 5 incorrect answers.
C. Find the probability of giving at least 1 correct answer.
D. Find the probability of giving exactly 1 correct answer.
Click here to see answer by stanbon(26259) |
Question 115598: A home security system is designed to be triggered in 96% of attempted burglaries. If 9 homes equipped with such a system experience an attempted burglary, find the probability that at least 8 alarms are triggered. Round your answer to four decimal places
Click here to see answer by stanbon(26259) |
Question 115905: p (girl,boy,girl) WITHOUT REPLACEMENT
P (boy,girl) WITHOUT REPLACEMENT
______________________________________________________________________________
p (Boy,girl) WITH REPLACEMENT
P (girl,girl,girl) WITH REPLACEMENT
Click here to see answer by Fombitz(2113)  |
Question 115926: I am trying to help my son with counting the elements of sets.
In a deck of 52 playing cards, how many are there of each type listed below?
1. an ace OR a spade?
5. a diamond AND a five?
What is the difference of and vs. or?
Click here to see answer by josmiceli(3003) |
Question 115939This question is from textbook Algebra 2
: Bob is moving and all of his CDs are mixed up in a box. Twelve CDs are rock, eight are jazz, and five are classical. If he reaches in the box and selects them at random, find each possibility.
What is the possibility of 3 rock cds?This question is from textbook Algebra 2
Click here to see answer by checkley71(8405) |
Question 115927: This is homework just need my answer checked please.
A telephone numbers consists of seven digits, the first three representing the exchange. How many different telephone numbers are possible within the 537 exchange?
is the answer
10x10x10x10=100,000
Click here to see answer by checkley71(8405) |
Question 116124: This is homework and I am having issues.
An ordinary (fair) die is a cube with the numbers 1 through 6 on the sides (represented by painted spots). Imagine that such a die is rolled twice in succession and that the face values of the two rolls are added together. This sum is recorded as the outcome of a single trial of a random experiment.
Compute the probability of each of the following events:
Event A : The sum is greater than 7 .
Event B: The sum is divisible by 2.
Write your answers as exact fractions.
Click here to see answer by solver91311(5072)  |
Question 116142: In an article in the Journal of Management, Morris, Avila and Allen studied innovation by surveying firms to find the number of new products introduced by the firms. A random sample of 100 California based firms is selected. Each firm is asked to report the number of new products introduced last year. The survey found that on average these firms introduced 5.68 products with a standard deviation of 8.70. Compute a 98% confidence interval for the new products introduced last year.
Click here to see answer by stanbon(26259) |
Question 116156: Eloise has put 5 cans (all of the same size) on her kitchen counter; 2 cans of vegetables, 2 cans of soup, and 1 can of peaches. Her son Andy, takes the labels off the cans and throws them away. Eloise then chooses 2 cans at random to open. Find the probability that she will open at least 1 can of soup.
Click here to see answer by Edwin McCravy(2920) |
Question 116211: Seven workers decided to send a delegation of 2 to their supervisor to discuss their grievances.
(a)How many different delegations are possible?
(b)If it is decided that a certain employee must be in the delegation, how many different delegations are possible?
(c)If there are 2 women and 5 men in the group, how many delegations would include at least 1 woman?
Click here to see answer by edjones(3291)  |
Question 116345: kevin does not know the answer to two questions on a multiple choice exam. the first question has five choices, the second question he does not know has six choices. what is the probability that he will get both questions wrong?
Click here to see answer by Edwin McCravy(2920) |
Question 116347: Kevin does not know the answer to two questions on a multiple choice exam.The first question has 5 choices,and the second question he does not know has 6 choices.What is the probability he will get both question wrong?
Click here to see answer by ilana(236) |
Question 116375: a deck of cards has a total of 52 cards, consisting of 4 suits; (spades, hearts, diamonds, and clubs); and 13 cards in each suit.
a. find the probability that a card will be a queen
b. find the probability that a card will be a heart
c. find the probability that the card will be a queen or a heart.
d. find the probability that a card will be the queen of hearts.
Click here to see answer by solver91311(5072) |
Question 116375: a deck of cards has a total of 52 cards, consisting of 4 suits; (spades, hearts, diamonds, and clubs); and 13 cards in each suit.
a. find the probability that a card will be a queen
b. find the probability that a card will be a heart
c. find the probability that the card will be a queen or a heart.
d. find the probability that a card will be the queen of hearts.
Click here to see answer by Fombitz(2113) |
Question 116516: The accounting department @ Weston Materials, Inc. reports that it takes two construction workers a mean of 32 hours and a standard deviation of 2 hours to erect the Red Barn model. Assume the assembly times follow the normal distribution.
a)Determine the z values for 29 and 34 hours. What percent of the garages take between 32 and 34 hours to erect?
b)What percent of the garages take between 29 hours and 34 hours to erect?
c)What percent of the g arages take 28.7 hours or less to erect?
d)Of the garages, 5 percent take how many hours or more to erect?
Click here to see answer by stanbon(26259) |
Question 116067: Hi , i tryed to solve this question several times but i always end up with this answer 0.1115, i have a final in 2 days :D can you plz help me out? thnx very much the question is the following :
A fair coin is tossed 30 times , whats the probability that the coin will show heads fewer than 17 times?
thnx again
Click here to see answer by stanbon(26259) |
Question 116391: Slips of paper marked with the numbers 1, 2, 3, 4 and 5 are placed in a box. After mixing well, two slips are drawn.
{(1,1),(1,2),(1,3),(1,4),(1,5),(2,1),(2,2),(2,3),(2,4),(2,5),(3,1),(3,2),(3,3),(3,4),(3,5)
(4,1),(4,2),(4,3),(4,4),(4,5),(5,1),(5,2),(5,3),(5,4),(5,5)}
Find the following:
(a)Both slips are marked with even numbers;
(b)Both slips are marked with odd numbers;
(c)Both slips are marked with the same number;
(d)One slip is marked with an odd number, the other with an even number.
Click here to see answer by stanbon(26259) |
Question 115966This question is from textbook Algebra 2
: Bob is moving and all of his CDs are mixed up in a box. Twelve CDs are rock, eight are jazz, and five are classical. If he reaches in the box and selects them at random, find each possibility.
What is the possibility of two classical cds and one rock cd?This question is from textbook Algebra 2
Click here to see answer by stanbon(26259) |
Question 116621: Susan has red, blue, green, and yellow sweaters. Joanne has green, red, purple, and white sweaters. Diane's sweaters are red, blue, purple, and mauve. Each girl has only one sweater of each color, and will pick a sweater to wear at random. Find the probabiltiy of each question!!!!
P(each girl chooses a different color)
P(each girl chooses the same color)
P(two girls choose the same color, and the third chooses a different color)
Thank you-Jasmine
Click here to see answer by edjones(3291) |
Question 116635: HI1
please help me with this problem . I am done with all my other homework except this one. I am in desperate need of help.
Kayla has 1.5cm (squared) of sheet metal to build a storage box for firewood.
a) what is the surface area of the metal , in square centimeters?
b) What are the dimensions for this square based prism box with maximum volume including a lid ?
c)If the box doesnt have a lid, what are the demensions of the square based prism. Round off to the nearest tenth of a centimeters.hint( make a table of possible boxes)
any help will be apreciated
for a) i think the area is 150 cm squared
for B according to my calculations the dimensions are 5 x 5 x 5 cm and the volume is 125 cm (cubed)
I dont know if my answers are correct and I am stuck on c)
any help will bw greatly appreciated . Pleas ehelp me
I need help desperately
Click here to see answer by edjones(3291) |
Question 116732: hi please help me with this. this is only what i am not done with an dhave to hand this in tomorrow. it is already 10 at night here. I am really worried
please help me
Kayla has 1.5 m (squared) of sheet metal to build a storage box for firewood.
a) what is the surface area of the metal , in square centimeters?
b) What are the dimensions for this square based prism box with maximum volume including a lid ?
c)If the box doesnt have a lid, what are the demensions of the square based prism. Round off to the nearest tenth of a centimeters.hint( make a table of possible boxes)
any help will be apreciated
for a) i think the area is 150 cm squared
for B according to my calculations the dimensions are 5 x 5 x 5 cm and the volume is 125 cm (cubed)
I dont know if my answers are correct and I am stuck on c)
any help will bw greatly appreciated . Please help me
I need help desperately
Click here to see answer by scott8148(3382)  |
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