Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 165970: can anyone please help me with this problem:
Use the given table to find the probability of the indicated event. Round your answer to the nearest thousandth.
College students were given three choices of pizza toppings and asked to choose one favorite. The following table shows the results.
toppings; freshman; sophomore; junior; senior
cheese; 10; 12; 24; 21
meat; 22; 21; 12; 10
veggie 12l; 10 22; 21
A randomly selected student prefers a meat topping.
a. .324
b. .0.61
c. .330
d. .185
Click here to see answer by jim_thompson5910(13787)   |
Question 166307: Assume that two marbles are drawn without replacement from a box with 1 blue, 3 white, 2 green, and 2 red marbles. Find the probability that the second marble is white, given that the first marble is blue.
Click here to see answer by Mathtut(3670) |
Question 166312: At one high school, students can run the 100-yard dash in an average of 15.2 seconds with a standard deviation of .9 seconds. The times are very closely approximated by a normal curve. Find the percent of times that are: greater than 16.1 seconds.
Click here to see answer by stanbon(26259) |
Question 166579: A jury has 12 jurors. A vote of at least 10 of 12 for "guilty" is necessary for a defendant to be convicted of a crime. Assume that each juror acts independently of the others and that the probability that any one juror makes the correct decision on a defendant is 0.88. If the defendant is guilty, what is the probability that the jury makes the correct decision? (Round your answer to 4 decimal places.)
Click here to see answer by edjones(3292)  |
Question 167214: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue
Click here to see answer by scott8148(3382)  |
Question 167214: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue
Click here to see answer by Edwin McCravy(2920) |
Question 167212: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue
Click here to see answer by scott8148(3382) |
Question 167211: I have 27 balls. 14 are red and 13 blue. I deceded to group the balls into a group of 3s ?
the balls will be choosen randomly.
What is the probablity that the group will have 2 red and 1 blue.
2)-the probability that the group will have all reds or all blue
Click here to see answer by scott8148(3382) |
Question 167424: Twenty-six percent of all cars crossing a toll bridge have a commuter sticker. What is the probability that among 11 randomly selected cars waiting to cross the bridge at least 3 have commuter stickers? (Round your answer to 4 decimal places.)
Click here to see answer by stanbon(26259) |
Question 167423: Nine customers at a supermarket are asked independently if they use brand X laundry soap. In general, 27% of the population use this brand. What is the probability that among the nine, more than two people use brand X? (Round your answer to 4 decimal places.)
Click here to see answer by stanbon(26259) |
Question 167241: suppose the prices of all three year old porsche 911 sports cars have a normal distribution with a mean of 48,125 and a standard deviation of 1600. what is the probability that a randomly selected three year old porsche 911 will sell for a price between 46,000 and 49,000?
Click here to see answer by stanbon(26259) |
Question 168033: A sample of 100 one-dollar bills from the Subway cash register revealed that 16 had something written on them besides the normal printing (e.g., “Bob ﾀ Mary”). (a) At α = .05, is this sample evidence consistent with the hypothesis that 10 percent or fewer of all dollar bills have anything written on them besides the normal printing? (a) At α = .05, is this sample evidence consistent with the hypothesis that 10 percent or fewer of all dollar bills have anything written on them besides the normal printing?
Click here to see answer by stanbon(26259) |
Question 168233: Hi, my question is :
The probability to pass in 60 examinations is 0.68, and the probability to fail is 0.32. Given, for the 5th examination, there has been 4pass and 1fail. What is the probability to get a pass in the 6th examination? and what is the probability to get a fail in the 6th examination?
Click here to see answer by edjones(3292) |
Question 168666: Each month in UP. a year level generates an average of 28 lbs of paper trash for recycling. Assume the standard deviation is 21lbs. Assume the variable is approximately normally distributed. If a year level is selected at random find the percentage of generating:
A. 0 between 27 and 31 lbs per month.
B. More than 30.2 lbs per month.
Click here to see answer by stanbon(26259) |
Question 168677: Two companies are bidding for two contracts,company A has a 75% chance and company B has a 25% chance. What is the probability that Company A will win both and of company A getting the first contract and Company B getting the second
Click here to see answer by gonzo(654) |
Question 168696: I do not have any idea how to even begin this. Can someone please show me how, with the steps? I am so confused. Thank you!
Find the area under the standard normal distribution curve for each.
a) Between z = 0 and z = 1.95.
b) Between z = 0 and z = .37
c) between z = 1.32 and z = 1.82
d) between z = -1.05 and z = 2.05
e) between z = - .03 and z = .53
f) between z = +1.10 and z = -1.80
g) to the right of z = 1.99
h) to the right of z = -1.36
i) to the left of z = -2.09
j) to the left of z = 1.68
Click here to see answer by oscargut(682)  |
Question 168722: A multiple choice quiz has 20 questions, each question has 4 answers only 1 is correct. if you randomly select one answer for each question find the probability that you will have 12 or more right answers?
Click here to see answer by stanbon(26259) |
Question 168766: Central limit theorem: Sample mean
Polychlorinated biphenyl (PCB) is among a group of organic pollutants found in a variety of products, such as coolants, insulating materials, and lubricants in electrical equipment. Disposal of items containing less than parts per million (ppm) PCB is generally not regulated. A certain kind of small capacitor contains PCB with a mean of ppm and a standard deviation of ppm. The Environmental Protection Agency takes a random sample of of these small capacitors, planning to regulate the disposal of such capacitors if the sample mean amount of PCB is ppm or more. Find the probability that the disposal of such capacitors will be regulated.
Carry your intermediate computations to at least four decimal places. Round your answer to at least three decimal places.
Click here to see answer by stanbon(26259) |
Question 168764: A toy manufacturer wants to see how long, on average, a new toy captures children's attention. He tests children selected at random and finds that their mean attention span is minutes with a standard deviation of minutes. If we assume that attention spans are normally distributed, find a confidence interval for the mean attention span of children playing with this new toy. Then complete the table below.Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
Click here to see answer by stanbon(26259) |
Question 168777: A study conducted by Ariel Mutual Funds and Charles Schwab Corporation surveyed 500 African American with an annual income above $50,000 and 500 white Americans with an annual income above $50,000. The results indicated that 74% of the African Americans and 84% of the whites owned stocks (Cheryl Winokur Munk, “Stock-Ownership Race Gap Shrinks”. “The Wall Street Journal, June 13, 2002, B11). Is there a difference between the proportion of African American with an annual income above $50,000 who invest in stocks and the proportion of whites with income an annual income above $50,000 who invest in stocks at a 95% level of confidence?
Click here to see answer by stanbon(26259) |
Question 168799: If A = {1,3,5,7,9}, B = {1,5,6,7} and C = {1,2,4,6,8,9} find:
i) A U B ii) the complement of (A U B) iii) the intersection of B and C
iv) find n(A U B) v) list all the subsets of B
Click here to see answer by Edwin McCravy(2920) |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 3871..3915, 3916..3960, 3961..4005, 4006..4050, 4051..4095, 4096..4140, 4141..4185, 4186..4230, 4231..4275, 4276..4320, 4321..4365, 4366..4410, 4411..4455, 4456..4500, 4501..4545, 4546..4590, 4591..4635, 4636..4680, 4681..4725, 4726..4770, 4771..4815, 4816..4860
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