Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 956993: A popular morning radio show offers free entrance tickets to the local boat show to the sixth caller who rings the station with the correct answer to a question. Assume that all calls are independent and have probability p = 0.7 of being correct. Let X be the random variable that counts the number of calls needed to find the winner.
Questions:
(a) What is the probability mass function of X?
(b) What is the probability of finding a winner on the 12th call?
(c) What is the probability that it will take more than ten calls to find a winner?
Click here to see answer by neovari001(1) |
Question 957151: A particular new car model is available with 5 choices of color, 3 choices of transmission, 4 types of interior, and 2 types of engine. How many different variations of this model are possible?
Click here to see answer by rfer(16322) |
Question 957048: find a formula for the probability distribution of the random variable x representing the number on a tag drawn at random from a box containing 12 tags 1 to 12. what is probability the number drawn is less than 4?
Click here to see answer by Fombitz(32388)  |
Question 957269: For the city of Quahog, R.I., assume the the mean household income is normally distributed with μ = $46,000 and σ = $5,060. If 35 households are randomly selected, determine the probability that their mean income is greater than $45,828.94.
Click here to see answer by stanbon(75887) |
Question 957194: Sample values from a normal population is given here:
65 71 81 72 72 51 65 74 58 65 83 64 55 60 67 67 69 98
Construct a 99% confidence interval on the mean of the population
PLEASE, PLEASE HELP - DEADLINE APPROACHING - LOST
Click here to see answer by Theo(13342)  |
Question 957401: A roulette wheel has 38 slots numbered 00, 0, 1, 2, ..., 35, 36. Eighteen of the slots numbered 1 through 36 are red and eighteen are black. The 00 and 0 slots are green. The ball is spun around the wheel until it falls into one of the slots. When a gambler bets $1 on a single number and wins, he gets $36 back (i.e. his net winnings are $35). Find the expected value of this game (in dollars).
Click here to see answer by stanbon(75887) |
Question 957451: An urn contains 4 red, 6 white, and 5 blue marbles. Three marbles are selected at random and without replacement. What is the probability that one of each color is selected? Give your answer as a decimal number, with 3 decimal places.
Click here to see answer by stanbon(75887) |
Question 957469: Question 4
A study is being conducted to monitor how second-level students progress in education and how this is influenced by the economic position of their school. A randomly selected sample of 300 pupils who complete the Junior Cycle are identified; they are then categorised by their subsequent education outcome, Category A being little or no further education, to Category E the furthest level of education. The schools they attended are put in groups 1 to 3, with group 1 schools being the most economically disadvantaged, group 3 being the least disadvantaged. The numbers of pupils in each category of school with each type of educational outcome are given in the table in ‘Dataset4’ in the Excel document.
Carry out an appropriate statistical test to to determine whether the data supports a link between category of school and educational outcome.
Dataset 4
------- G1----- G2----- G3
A------ 8------ 7------ 10
B------ 7------ 7------ 10
C------ 7------ 7------ 12
D------ 7------ 8------ 14
E------ 8------ 9------ 17
Click here to see answer by stanbon(75887) |
Question 957504: Ashley wanted to see the probability of buying a carton of eggs at the store and getting a cracked egg. He found the probability of getting no cracked eggs is 0.72 and the probability of getting a cracked egg is 0.18. What is wrong with Ashley's probability model?
Click here to see answer by macston(5194)  |
Question 957636: solve using the standard normal distribution as an approximation to the binomial distribution. salesperson s. is successful, that is makes a sale, in an average of 35% of their calls. to win a special award, s. must average 50% sales for the next week. if they make 50 calls next week, what is the probability that they will make fewer than 25 sales and fail to win the award? draw a picture to start out with!!
Click here to see answer by stanbon(75887) |
Question 957689: Could you please tell me if the following is correctly calculated:
Construct a 90% confidence interval for a mean of a normal population, given a random sample of 12 values with a mean and standard deviation of 270 and 14.6, respectively.
I used t-interval and the answers were (262.43, 277.57)
Please let me know if I am calculating this properly - Thank you in advance.
Click here to see answer by Theo(13342)  |
Question 957876: Suppose you have a key ring with eight keys on it, one of which is your house key. Further suppose you get home after dark and cant see the keys on the key ring. You randomly try one key at a time, being careful not to mix the keys you have already tried with the ones you have not. What is the probability that you get the right key on the fifth try.
Click here to see answer by Theo(13342)  |
Question 858297: Suppose you're in a class of 35 students. The instructor takes a simple random sample of 7 students and observes their heights. Imagine all of the different samples possible. Let X denote the tallest height in your sample. The distribution of all values taken by X in all possible samples of 7 students selected from the 35 students in your class is
A.the probability that X is obtained.
B.the sampling distribution of X.
C.the standard deviation of values.
D.the parameter.
Click here to see answer by carlocarlopr(1) |
Question 958072: A insurance company charges their clients $1400 annual premium. The company estimates that each time a patient that is hospitalized $2450. They estimated that 85% will not be hospitalized, 10% hospitalized once a yr and no one will be hospitalized more than twice.
what is the company expected profit and what is their profit for 30,000 clients?
Click here to see answer by stanbon(75887) |
Question 958203: According to the national highway travel survey, about 14.5% of workers aged sixteen and over commute to work in a carpool. Eight workers are selected at random. Find the probability that at least 5 carpool
Click here to see answer by stanbon(75887) |
Question 958165: Fifty balls are numbered 150 and a red dot is painted on those balls that are a multiple of 7. The balls are mixed into a bag and one ball is randomly chosen. What is the probability that the ball is numbered with a multiple of 5 or has a red dot
Click here to see answer by Fombitz(32388)  |
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36721..36765, 36766..36810, 36811..36855, 36856..36900, 36901..36945, 36946..36990, 36991..37035, 37036..37080, 37081..37125, 37126..37170, 37171..37215, 37216..37260, 37261..37305, 37306..37350, 37351..37395, 37396..37440, 37441..37485, 37486..37530, 37531..37575, 37576..37620, 37621..37665, 37666..37710, 37711..37755, 37756..37800, 37801..37845, 37846..37890, 37891..37935, 37936..37980, 37981..38025, 38026..38070, 38071..38115, 38116..38160, 38161..38205, 38206..38250, 38251..38295, 38296..38340, 38341..38385, 38386..38430, 38431..38475, 38476..38520, 38521..38565, 38566..38610, 38611..38655, 38656..38700, 38701..38745, 38746..38790, 38791..38835, 38836..38880, 38881..38925, 38926..38970, 38971..39015, 39016..39060, 39061..39105, 39106..39150, 39151..39195, 39196..39240, 39241..39285, 39286..39330, 39331..39375, 39376..39420, 39421..39465, 39466..39510, 39511..39555, 39556..39600, 39601..39645, 39646..39690, 39691..39735, 39736..39780, 39781..39825, 39826..39870, 39871..39915, 39916..39960, 39961..40005, 40006..40050, 40051..40095, 40096..40140, 40141..40185, 40186..40230, 40231..40275, 40276..40320, 40321..40365, 40366..40410, 40411..40455, 40456..40500, 40501..40545, 40546..40590, 40591..40635, 40636..40680, 40681..40725, 40726..40770, 40771..40815, 40816..40860, 40861..40905, 40906..40950, 40951..40995, 40996..41040, 41041..41085, 41086..41130, 41131..41175, 41176..41220, 41221..41265, 41266..41310, 41311..41355, 41356..41400, 41401..41445, 41446..41490, 41491..41535, 41536..41580, 41581..41625, 41626..41670, 41671..41715, 41716..41760, 41761..41805, 41806..41850, 41851..41895, 41896..41940, 41941..41985, 41986..42030, 42031..42075, 42076..42120, 42121..42165, 42166..42210, 42211..42255, 42256..42300, 42301..42345, 42346..42390, 42391..42435, 42436..42480, 42481..42525, 42526..42570, 42571..42615, 42616..42660, 42661..42705, 42706..42750, 42751..42795, 42796..42840, 42841..42885, 42886..42930, 42931..42975, 42976..43020, 43021..43065, 43066..43110, 43111..43155, 43156..43200, 43201..43245, 43246..43290, 43291..43335, 43336..43380, 43381..43425, 43426..43470, 43471..43515, 43516..43560, 43561..43605, 43606..43650, 43651..43695, 43696..43740, 43741..43785, 43786..43830, 43831..43875, 43876..43920, 43921..43965, 43966..44010, 44011..44055, 44056..44100, 44101..44145, 44146..44190, 44191..44235, 44236..44280, 44281..44325, 44326..44370, 44371..44415, 44416..44460, 44461..44505, 44506..44550, 44551..44595, 44596..44640, 44641..44685, 44686..44730, 44731..44775, 44776..44820, 44821..44865, 44866..44910, 44911..44955, 44956..45000, 45001..45045, 45046..45090, 45091..45135, 45136..45180, 45181..45225, 45226..45270, 45271..45315, 45316..45360, 45361..45405, 45406..45450, 45451..45495, 45496..45540, 45541..45585, 45586..45630, 45631..45675, 45676..45720, 45721..45765, 45766..45810, 45811..45855, 45856..45900, 45901..45945, 45946..45990, 45991..46035, 46036..46080, 46081..46125, 46126..46170, 46171..46215, 46216..46260, 46261..46305, 46306..46350, 46351..46395, 46396..46440, 46441..46485, 46486..46530, 46531..46575, 46576..46620, 46621..46665, 46666..46710, 46711..46755, 46756..46800, 46801..46845, 46846..46890, 46891..46935, 46936..46980, 46981..47025, 47026..47070, 47071..47115, 47116..47160, 47161..47205, 47206..47250, 47251..47295, 47296..47340, 47341..47385, 47386..47430, 47431..47475, 47476..47520, 47521..47565, 47566..47610, 47611..47655, 47656..47700, 47701..47745, 47746..47790, 47791..47835, 47836..47880, 47881..47925, 47926..47970, 47971..48015, 48016..48060, 48061..48105, 48106..48150, 48151..48195, 48196..48240, 48241..48285, 48286..48330, 48331..48375, 48376..48420, 48421..48465, 48466..48510, 48511..48555, 48556..48600, 48601..48645, 48646..48690, 48691..48735, 48736..48780, 48781..48825, 48826..48870, 48871..48915, 48916..48960, 48961..49005, 49006..49050, 49051..49095, 49096..49140, 49141..49185, 49186..49230, 49231..49275, 49276..49320, 49321..49365, 49366..49410, 49411..49455, 49456..49500, 49501..49545, 49546..49590, 49591..49635, 49636..49680, 49681..49725, 49726..49770, 49771..49815, 49816..49860, 49861..49905, 49906..49950, 49951..49995, 49996..50040, 50041..50085, 50086..50130, 50131..50175, 50176..50220, 50221..50265, 50266..50310, 50311..50355, 50356..50400, 50401..50445, 50446..50490, 50491..50535, 50536..50580, 50581..50625, 50626..50670, 50671..50715, 50716..50760, 50761..50805, 50806..50850, 50851..50895, 50896..50940, 50941..50985, 50986..51030, 51031..51075, 51076..51120, 51121..51165, 51166..51210, 51211..51255, 51256..51300, 51301..51345
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