Tutors Answer Your Questions about Probabilityandstatistics (FREE)
Question 119143: I'm not sure if I choose the right type I am sorry if it is not.
27 people applied for a certain managerial job. According to one report, the first interview narrowed the field down to fewer than 7 candidates.Another report claimed that the first interview eliminated fewer than 23 applicants from consideration. If both reports are true, and if x applicants were eliminated by the first interview, what are the possible values of x?
a)21 only
b)22 only
c)20 and 21 only
d)21 and 22 only
e)21,22, and 23 only
I don't know what type of math to use to solve this problem. Thank you very much for your help, it is greatly appreciated.
Click here to see answer by Fombitz(25151) 
Question 119092: pls answer this question for me..
" if an experiment consist of tossing a die once and drawing 2 balls in succession w/ replacement if the outcome in the die is a prime number, otherwise balls are drawn w/o replacement.
(note: 1 is not a prime number; the urn contains 2 red and 1 black balls)
find the probability that:
a. the balls are drawn w/o replacement.
b. ball drawn include at least 1 red ball in (w/ replacement, w/o replacement).
c. the balls drawn are of different colors in(w/ replacement, w/o replacement).
d. the ball drawn are both black given that the outcome in the die is prime in
(w/ replacement, w/o replacement).
please help me answer this problem.. a million thanks!
Click here to see answer by solver91311(20879) 
Question 119319: Each of the letters D E T E R M I N E D is written on a card. YOu mix the cards thoroughly. What is the probability of selecting an E, then an M? The first card is replaced before selecting the second card.
Click here to see answer by stanbon(69061) 
Question 119319: Each of the letters D E T E R M I N E D is written on a card. YOu mix the cards thoroughly. What is the probability of selecting an E, then an M? The first card is replaced before selecting the second card.
Click here to see answer by Fombitz(25151) 
Question 119471: sirs,
please help me regarding this problem:
"there are 3 urns containing several balls. Urn 1 has 5 white, 3 green, and 2 red balls. Urn 2 contains 1 white, 6 green and 3 red balls. Urn 3 contains 3 white, 1 green and 6 red balls. a die is tossed once. if 1 appears, a ball is drawn from urn 1. if 2 or 3 appears, a ball is drawn from urn 2. otherwise, a ball is drawn from urn 3. determine (a) the probability that a red ball is chosen, and (b) the probability that urn 3 is chosen, given that the red ball is chosen."
thank you very much
sincerely,
cebrian
Click here to see answer by Fombitz(25151) 
Question 119633: In the carnival game "chuckaluck," you pick a number from 1 to 6 and roll 3 dice in succession. If your number comes up all 3 times, you win $3; if your number comes up twice, you win $2; if it comes up once, you win $1; otherwise you lose $1. What is your expected gain or loss?
Click here to see answer by stanbon(69061) 
Question 119565: This is not out of a book this is homework  any help is greatly appreciated.
A machine is set to fill a small bottle with 9.0 grams of medicine. A sample of eight bottles revealed the following amounts (grams) in each bottle.
9.2 8.7 8.9 8.6 8.8 8.5 8.7 9.0
At the .01 significance level, can we conclude that the mean weight is less than 9.0 grams?
a. State the null hypothesis and the alternate hypothesis.
b. How many degrees of freedom are there?
c. Give the decision rule.
d. Compute the value of t. What is your decision regarding the null
hypothesis?
e. Estimate the pvalue.
Click here to see answer by stanbon(69061) 
Question 120561: Jerry worked for one day on a project that he could have completed alone in nine days. Bill joined Jerry the next day, and they worked together for exactly three days to complete the project. How much of the job did Bill do in those three days? Express you answer as a common fraction.
Bill worked 3 out of 4 days, but it could have been done in 9 days which would be 8 out of 9 days for Bill if he was working alone. Jerry worked 1 day out of 4 and 1 day out of 9 possible days.
3/4 x 8/9 = 24/36 = 2/3
I say the answer is 2/3 for how much of the work Bill did.
Click here to see answer by ankor@dixienet.com(18980) 
Question 120750: Your computer password has 4 capital letters followed by 4 digits. Your friend randomly chooses 4 capital letters and 4 digits. Find the probability that your friend chooses your password
Thanks for your help!
beckmangn@wowway.com
Click here to see answer by rapaljer(4670) 
Question 120952: So that zip codes may be machine readable, the postal service encodes them as a group five bars, some tall, some short, in groups osf five. In how many distinct ways can two tall and three short bars be arranged?
Click here to see answer by stanbon(69061) 
Question 121514: Please help this needs to be done by tonight January 21 and I'm lost
If you use Excel, submit a single Excel attachment with labeled tabs; please do not submit multiple Excel attachments. A PowerPoint attachment is OK, too. I’ll deduct a point for every extra attachment.
2  Research at the University of Toledo indicates that 50 percent of the students change their major area of study after their first year in a program. A random sample of 100 students in the College of Business revealed that 48 had changed their major area of study after their first year of the program. Has there been a significant decrease in the proportion of students who change their major after the first year in this program? Test at the .05 level of significance.
Click here to see answer by stanbon(69061) 
Question 121805: 22. A train runs every 15 minutes. You arrive at the train station without consulting the train's schedule. What is the probability that you will wait more than 10 minutes for the train?
20. An event has even odds when the odds in favor of (or against) the event are 1:1, what is the probability of an event with even odds?
Click here to see answer by stanbon(69061) 
Question 122049: Hypothesis testing
A recent article in the Wall Street Journal reported that the 30year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30 year rates (in percent):
4.8 5.3 6.5 4.8 6.1 5.8 6.2 5.6
At the .01 significance level, can we conclude that the 30year mortgage rate for small banks is less than 6 percent? Estimate the pvalue.
Click here to see answer by stanbon(69061) 
Question 122186: Johnny found that the large ones totaled 30 more than 3 times the number of small ones. The ratio of the number of small ones to the number of large ones was 1 to 6. How many were large and how many were small?
Click here to see answer by edjones(8007) 
Question 122282: I know the answer from the answer book, but I can't figure out how to set up the problem to arrive at the answer. So I'd like to see an example of how to set up the problem. Here is the problem:
The ratio of the two numbers was 7 to 2. When Sir Richard and Marion multiplied the denominator by 10 they found that the result was 84 greater than twice the numerator. What were the numbers?
Thanks
Click here to see answer by ankor@dixienet.com(18980) 

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, 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7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 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23941..23985, 23986..24030, 24031..24075, 24076..24120, 24121..24165, 24166..24210, 24211..24255, 24256..24300, 24301..24345, 24346..24390, 24391..24435, 24436..24480, 24481..24525, 24526..24570, 24571..24615, 24616..24660, 24661..24705, 24706..24750, 24751..24795, 24796..24840, 24841..24885, 24886..24930, 24931..24975, 24976..25020, 25021..25065, 25066..25110, 25111..25155, 25156..25200, 25201..25245, 25246..25290, 25291..25335, 25336..25380, 25381..25425, 25426..25470, 25471..25515, 25516..25560, 25561..25605, 25606..25650, 25651..25695, 25696..25740, 25741..25785, 25786..25830, 25831..25875, 25876..25920, 25921..25965, 25966..26010, 26011..26055, 26056..26100, 26101..26145, 26146..26190, 26191..26235, 26236..26280, 26281..26325, 26326..26370, 26371..26415, 26416..26460, 26461..26505, 26506..26550, 26551..26595, 26596..26640, 26641..26685, 26686..26730, 26731..26775, 26776..26820, 26821..26865, 26866..26910, 26911..26955, 26956..27000, 27001..27045, 27046..27090, 27091..27135, 27136..27180, 27181..27225, 27226..27270, 27271..27315, 27316..27360, 27361..27405, 27406..27450, 27451..27495, 27496..27540, 27541..27585, 27586..27630, 27631..27675, 27676..27720, 27721..27765, 27766..27810, 27811..27855, 27856..27900, 27901..27945, 27946..27990, 27991..28035, 28036..28080, 28081..28125, 28126..28170, 28171..28215, 28216..28260, 28261..28305, 28306..28350, 28351..28395, 28396..28440, 28441..28485, 28486..28530, 28531..28575, 28576..28620, 28621..28665, 28666..28710, 28711..28755, 28756..28800, 28801..28845, 28846..28890, 28891..28935, 28936..28980, 28981..29025, 29026..29070, 29071..29115, 29116..29160, 29161..29205, 29206..29250, 29251..29295, 29296..29340, 29341..29385, 29386..29430, 29431..29475, 29476..29520, 29521..29565, 29566..29610, 29611..29655, 29656..29700, 29701..29745, 29746..29790, 29791..29835, 29836..29880, 29881..29925
