Tutors Answer Your Questions about Probability-and-statistics (FREE)
Question 40455: please help and explain
car thieves steal one automobile out of 400 of a certain type every year in a certain city. What annual net premium shoukd an owner pay for theft insurance in the amount of $16,000 on the certain type of car?
I dont even understand how you would know what premiums should be????
Click here to see answer by stanbon(26259)   |
Question 40474: Can someone please help me with this question.
Calculate the number of male and female students required to ensure a sample of 10 students contains the same proportions as the full population, which contains 22 male and 28 female students.
Thanks alot
Click here to see answer by stanbon(26259) |
Question 40344: Two different awards are to be given to two different dogs at the dog show. If there are 12 Labradors, 18 Collies and 5 Shelties, how many different ways can the awards be presented?
Two different awards are to be given to students who attend Cal Poly. The nominees included 9 Accounting majors, 6 Math majors, and 2 Biology majors. In how many different ways can the awards be given to students with different majors?
Twenty of the houses on a street receive cable t.v. and seven do not. A researcher studying the amount of time that people watch t.v. intends to visit five of the houses that receive cable t.v and two that do not. How many such selections of houses are there?
If the probability that A occurs is .21, the probability that B occurs is .34, and the probability that both occur is .05. What is the probability that A does not occur? Round your answer to two decimal places.
Click here to see answer by Nate(3495) |
Question 41195: population of a given town is given by the formula P=1500e^(.04t), where t= time in years and year 0 is the calendar year 2000
what is the popultion in 2000? in year 2010? what year will the population reach 3000?
Click here to see answer by Nate(3495) |
Question 41633: An ice cream store has 31 flavors and 10 toppings. A sundae has one flavor of ice cream, one topping , and comes with or without whipped cream. How many different sundaes can be ordered?
Thank You
Click here to see answer by Nate(3495) |
Question 41639: For 2000 patients, blood-clotting time was normally distributed with a mean of 8 seconds and a standard deviation of 3 seconds. What percent had blood-clotting times between 5 and 11 seconds?
Thanks
Click here to see answer by Nate(3495) |
Question 41868This question is from textbook 
: Kevin earned $165.00 interest for 1 year on an investment of $1500.00. At the same rate, what amount of interest would be earned by an investment of $2500.00?
Thanks!This question is from textbook
Click here to see answer by checkley71(8405) |
Question 41886: The time a group of high school students arrive home from school each day was found to be normally distributed. The mean time was 3:15 PM and the times had a standard deviation of 15 minutes. What is the probability that a student chosen at random arrives home from school before 2:30 PM?
Click here to see answer by fractalier(1804)  |
Question 42617: A bookshelf holds 4 mysteries, 3 biographies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book.
Thank You
Click here to see answer by Socom491(19) |
Question 41194: population of a given town is given by the formula P=1500e.04t, where t= time in years and year 0 is the calendar year 2000
what is the popultion in 2000? in year 2010? what year will the population reach 3000?
Click here to see answer by fractalier(1804) |
Question 38712: 1) There are four letters and four envelopes. If the letters are placed in the
envelopes at random, what is the probability that not more than one letter is placed in the correct envelope?
2) The equation of regression lines are
3x+12y=19
3y+9x=46
Find 1) Correlation co- efficient
2) Mean value of X and Y
3) Ratio of the co- efficient of variability of X to Y
Click here to see answer by stanbon(26259) |
Question 41884: Help Please
Use the following table to find the mean, median, mode, standard diviation, and determine if the data appears to be positively, negatively, or normally distributed. Round to the nearest hundredth, if necessary.
State # 0f Schools
Florida 456
Georgia 306
Maine 160
Massachusetts 363
North Carolina 376
New York 935
Rhode Island 54
Virginia 349
Click here to see answer by stanbon(26259) |
Question 44038: The probability of winning on a slot machine is 5%. If a person plays the machine 500 times, find the probability of winning 30 times. Use the normal approximation to the binomial distribution.
Click here to see answer by Nate(3495) |
Question 44280: An African hospital is treating patients who have Lhassa Fever. Seventy percent of patients with this disease die, and each patient lives or dies independently of other patients.
Suppose over along period, the hosptial expects to treat 100 patients. What is the mean number of deaths expected during this period? My answer is 100 x .70 = 70 patients.
The 2nd part of that is suppose over a long period, the hospital expects to treat 100 patients. What is the standard deviation of the number of deaths expected during this period? (I am not sure how to begin finding this answer)
Click here to see answer by mbarugel(146) |
Question 44281This question is from textbook Elementary Statistics
: In one region, the September energy consumption levels for single family homes are found to be normally distributed with a mean of 2995 kwh and a standard deviation of 1050 kwh.
a. for a randomly selected home, find the probability that the September energy consumption level is below 200 kwh.
b. for a randomly selected home, find the probability that the September energy consumption level is between 2100 kwh and 2200 kwh
c. for a randomly selected home, find the probability taht the September energy consumption level is above 1900 kwh.
d. find the energy consumption level that separates the bottom 15% from the top 85%This question is from textbook Elementary Statistics
Click here to see answer by AnlytcPhil(958) |
Question 44279: An African hospital is treating patients who have Lhassa Fever. Seventy percent of patients with this disease die, and each patient lives or dies independently of other patients.
Suppose over along period, the hosptial expects to treat 100 patients. What is the mean number of deaths expected during this period? My answer is 100 x .70 = 70 patients.
The 2nd part of that is suppose over a long period, the hospital expects to treat 100 patients. What is the standard deviation of the number of deaths expected during this period? (I am not sure how to begin finding this answer)
Click here to see answer by fractalier(1804) |
Question 44427: You are going to be flipping four coins at once: a penny, a nickel, a dime, and a quarter. How many ways are there for the four coins to come up? Also, what is the likelihood of getting four heads on the first toss of each coin?
Click here to see answer by stanbon(26259) |
Question 44521: Toss three coins 20 times and determine the empirical probability of obtaining three heads. Using the data from part a, determine the empirical probability of not obtaining 3 heads and determine the empirical probability of obtaining two heads and a tail.
Click here to see answer by venugopalramana(3286)  |
Question 44523: There is one more that I can't get.
Roll a pair of dice 20 times and count the number of times you get a 7 and the number of times you get an 9.
I did this but I can't figure out the following:
a. Compute Pe(7)
b Compute Pe(8)
c Compute Pe (7 or 8)
d Compute Pe (7) + pe (8)
e Explain why the results of parts c and d are as they are.
Click here to see answer by venugopalramana(3286) |
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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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