Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 663866: A computer programmer is designing a secure encryption key for a new wireless networking protocol. The protocol picks 2 random letters A to Z to make the key. How many keys are possible if the order of the letters matters and letters can repeat???
Click here to see answer by DrBeeee(684)  |
Question 663884: Hello
Could I please get some help with this problem. I am really confused on how to even get it started?
A set of 50 data values has a mean of 15 and a variance of 36. Find the standard score of a data value = 15
THanks
Click here to see answer by Theo(13342)  |
Question 663913: You pick 5 apples from a grocery store owned by the professor. The probability of a randomly chosen apple being rotten is 0.518. Let X represent the number of apples that are NOT rotten. Find the probability of X=k in the table below.
k P(X = k)
0
1
2
3
4
5
I tried multiplying .482*0 then .482*1 all the way down the table.
Click here to see answer by solver91311(24713)  |
Question 663913: You pick 5 apples from a grocery store owned by the professor. The probability of a randomly chosen apple being rotten is 0.518. Let X represent the number of apples that are NOT rotten. Find the probability of X=k in the table below.
k P(X = k)
0
1
2
3
4
5
I tried multiplying .482*0 then .482*1 all the way down the table.
Click here to see answer by ewatrrr(24785)  |
Question 663913: You pick 5 apples from a grocery store owned by the professor. The probability of a randomly chosen apple being rotten is 0.518. Let X represent the number of apples that are NOT rotten. Find the probability of X=k in the table below.
k P(X = k)
0
1
2
3
4
5
I tried multiplying .482*0 then .482*1 all the way down the table.
Click here to see answer by jim_thompson5910(35256) |
Question 663857: In an experiment involving a treatment applied to 5 test subjects, researchers plan to use a simple random sample of 5 subjects selected from a pool of 7 available subjects. How many different random samples are possible???
Click here to see answer by DrBeeee(684) |
Question 663918: The television show Found has been successful for many years. That show recently had a share of 27, meaning that among the TV sets in use, 27% were tuned to Found. Assume that an advertiser wants to verify that 27% share value by conducting its own survey, and a pilot survey begins with 15 households have TV sets in use at the time of a Found broadcast.
Find the probability that none of the households are tuned to Found.
P(none) =
Find the probability that at least one household is tuned to Found.
P(at least one) =
Find the probability that at most one household is tuned to Found.
P(at most one) =
I am not sure how to even start this problem to be completely honest.
Click here to see answer by solver91311(24713) |
Question 664032: this is a probability question:
What is the probability of drawing 3 cards that are all 7 from a deck of cards?
The answer key shows 1/140608 as the answer, but I do not know how that answer was gotten. Please help - Thanks.
P. Rochelle
rosenwald56@att.net
Click here to see answer by jim_thompson5910(35256) |
Question 663874: For a certain mathematics class, the scores are normally distributed with a mean of 75 and a standard deviation of 8. The teacher wishes to give A’s to the top 6% of the students and F’s to the bottom 6%. The next 16% in either direction will be given B’s and D’s, with the other students receiving C’s. Find the bottom cutoff for the grades.
I have tried this problem about a dozen different ways, and I'm just confusing myself further. Any hints on how to get started the correct way? Thank you!
Click here to see answer by Theo(13342) |
Question 664090: You are given the sample mean and the standard deviation. Use this information to construct the 90% and 95% confidence intervals for the population mean. A random sample of 32 eight ounce drinks has a mean of 86.7 calories and a standard deviation of 43.9 calories.
The 90% CI is
The 95% CI is
Click here to see answer by Theo(13342) |
Question 664027: I. Use Chebyshev’s theorem to find what percent of the values will fall between 249 and 333 for a data set with a mean of 291 and standard deviation of 14.
II. Use the Empirical Rule to find what two values 99.7% of the data will fall between for a data set with a mean of 219 and standard deviation of 20
Click here to see answer by stanbon(75887) |
Question 664323: A study reported that in a random sampling of 100 women over the age of 35 showed that 8 of the women were married 2 or more times. Based on the study results, how many women in a group of 5,000 women over the age of 35 would likely be married 2 or more times?
Click here to see answer by stanbon(75887) |
Question 664335: Suppose we have a set of blood pressures with a mean of 70 Diastolic, and a sample standard deviation of 10 points. Assuming a normal distribution of Diastolic blood pressures, between what two values should 95% of all Diastolic blood pressures lie?
Click here to see answer by stanbon(75887) |
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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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