Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 1016026:
Suppose that the average score on the GMAT exam is 500 and that the standard deviation of all scores is 100 points. You would expect approximately 95% of all GMAT scores to be between which?
a. 400 and 600
b. 300 and 700
c. 200 and 800
d. 350 and 650
e. 250 and 750
Click here to see answer by richard1234(7193)  |
Question 1015233: Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation 9.
Develop a 99% confidence interval for the population mean. (Round your answers to 3 decimal places.)
The confidence interval is between
Click here to see answer by Fombitz(32388)  |
Question 1016579: I really need your help in solving this problem. I appreciate your time and efforts. Have a terrific day :) Here is the question?
On a exam, with a mean of M= 82, you obtain a score, of X = 86.
A. Would you prefer a standard deviation of s=2 or s=10? (Hint: Sketch each distribution and find the location of your score.)
B. If your score x =78, would you prefer s= 2 or s= 10? Explain your answer.
Thank you in advance, for helping me out.
Yours,
Jay
Click here to see answer by Fombitz(32388)  |
Question 1016642: A Sample consists of 75 television sets purchased several years ago. The replacement rimes of those TV sets have a mean of 8.2 years and use 1.1 as standard deviation.
Construct and interpret a 90% confidence interval for the mean replacement time of all TV sets from that ear ?
Click here to see answer by Boreal(15235)  |
Question 1016637: Find the Probability of, A King, ace, jack of clubs or queen of diamonds appears in drawing a single card from a well shuffled ordinary deck of 52 cards.
why we take 4,4,1,1 probability of King,Ace ,Jack of Clubs or Queen of Diamonds?
Click here to see answer by Boreal(15235)  |
Question 1016582: I need help trying to solve this problem. Thank you in advance, for helping me out. I really appreciate your time and efforts. Have a terrific day :) Here is the question:
The range is completed determined by the two extreme scores in a distribution. The standard deviation for the following sample of n= 5 scores. Note that there are three scores clustered around the mean in the center of the distribution, and two extreme values.
Scores: 0, 6, 7, 8, 14.
B. Now we will break up the cluster in the center of the distribution by moving two of the central scores out to the extremes. Once again compute the range and the standard deviation.
New scores: 0, 0, 7, 14, 14.
C. According to the range, how do the two distributions compare in variability? How do they compare according to the standard deviation?
Yours,
John Cruz
Click here to see answer by KMST(5328)  |
Question 768686: Consumers spend an average of $21 per week in cash
without being aware of where it goes (data extracted from
“Snapshots: A Hole in Our Pockets,” USA Today, January
18, 2010, p. 1A). Assume that the amount of cash spent
without being aware of where it goes is normally distributed
and that the standard deviation is $5.
a. What is the probability that a randomly selected person
will spend more than $25?
b. What is the probability that a randomly selected person
will spend between $10 and $20?
c. Between what two values will the middle 95% of the
amounts of cash spent fall?
Click here to see answer by mtorres100(1) |
Question 1016877: Help is urgently needed:
A group of 6 students went to see a play for their English class. How many ways can the students be seated next to each other in a row if two bestfriends who are part of the group insist on seating next to each other?
Click here to see answer by rothauserc(4718)  |
Question 1016869: I really need your help in solving this problem. I appreciate your time and efforts. Have a terrific day :) Here is the question:
Calculate SS variance, and Standard deviation for the following sample of
n = 4 scores: 3, 1, 1, 1,
(Note: the Computational formula works well with these scores.)
Yours,
Jay
Click here to see answer by rothauserc(4718)  |
Question 1016860: A room is 12 feet long, 8 feet wide and 10 feet high. Find the cost of whitewashing the four wall inside the room, leaving out two doors each measuring 7 feet high and 4 feet wide and four windows each measuring 4 feet high and 3 feet wide if the rate is tk. 12 per square feet.
Click here to see answer by Cromlix(4381)  |
Question 1016962: Your firm has 6 different manufacturing lines that each produce the same type of widget. There is a 93 percent chance that each line is functional on any given day. Assuming a Bernoulli process what is the probability of all six manufacturing lines working on any given day?
Click here to see answer by mathmate(429)  |
Question 1017403:
There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on a scale from 1 to 36. The distribution of ACT scores are approximately Normal with mean and standard deviation . SAT scores are reported on a scale from 600 to 2400. The distribution of SAT scores is approximately Normal with mean and standard deviation
What SAT scores make up the bottom 10% of all scores?
Fill in the blank:
(Round your answer to a whole number.)
The SAT scores 600 to _______ make up the bottom 10% of all scores.
Click here to see answer by Boreal(15235)  |
Question 1017445: A safety committee of 2 has to be firmed from 30 studentd. 8 study physics. 10 study chemistry. 12 study biology. If the same student cannot be choosen twice whats the probability that
A. Both students are studing physics
B. The first studies biology the second studies chemistry
C. That both students choosen study same subject
Click here to see answer by Boreal(15235)  |
Question 1017571: The probability that a student will graduate with honors and get a good job is 0.09 whereas the probability that a student will graduate with honors is 0.1. What is the probability that a student will get a good job if she graduates with honors? ans: 90% how ?
Click here to see answer by Theo(13342)  |
Question 1018046: I really need your help in solving this problem. I appreciate your time and efforts. Have a terrific day :) Here is the question:
Calculate SS, variance and standard deviation for the following sample n= 4 scores:
3,1,1,1. (Notes: The computational formula works well with these scores.)
Yours,
Jay
Click here to see answer by lpcruz(7) |
|
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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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