# Questions on Algebra: Probability and statistics answered by real tutors!

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 Algebra: Probability and statistics Solvers Lessons Answers archive Quiz In Depth

 Question 413423: If you divide a force measure in newtons (1 newton = 1kg. ( m/s^2 ) by a speed expressed in meter per second, in what unit will the answer be express? (Physic home work) Click here to see answer by richard1234(5390)

 Question 413498: Suppose D, E, and F are independent events with P(D) = 0.21 , P(E) = 0.48, and P(F) = 0.18. What is the probability that at least one of the three events occurs? Click here to see answer by Theo(3464)

 Question 413497: ten students are playing in a chess tournament. If each student plays every other student once , how many total games are played? Click here to see answer by sudhanshu_kmr(1152)

 Question 413531: Suppose the newspaper states that the probability of rain today is 30%. what is the complement of the event "rain today"? what is the probability of the complement? Click here to see answer by kamallohia(18)

 Question 413632: determine the odds for and against each event for the given probabliity: P(H)= 1/4 P(G)= .1 Click here to see answer by sudhanshu_kmr(1152)

 Question 413624: I was wondering if I could get confirmation if I got this problem right. 3 cans were accidentally filled with regular soda in a 12 pack of diet soda. 2 cans are selected randomly: a.) what is the probabilty that both cans are diet soda. C(3,2)/(12,2)= 0.045 b.)what is the probabilty that both cans are regular. C(10,2)/C(12,2)= 0.68 c.) what is the probabiltiy that exactly 1 can is diet and 1 is regular. DIET: C(3,1)/C(12,1)= 0.12 REG: C(10,1)/C(12,1)= 0.12 Thanks for a ll your help, Kim Click here to see answer by sudhanshu_kmr(1152)
 Question 413624: I was wondering if I could get confirmation if I got this problem right. 3 cans were accidentally filled with regular soda in a 12 pack of diet soda. 2 cans are selected randomly: a.) what is the probabilty that both cans are diet soda. C(3,2)/(12,2)= 0.045 b.)what is the probabilty that both cans are regular. C(10,2)/C(12,2)= 0.68 c.) what is the probabiltiy that exactly 1 can is diet and 1 is regular. DIET: C(3,1)/C(12,1)= 0.12 REG: C(10,1)/C(12,1)= 0.12 Thanks for a ll your help, Kim Click here to see answer by Edwin McCravy(8909)

 Question 413651: Bill has 4 tiles. Each tile has a different letter. How many different ways can Bill arrange the tiles in a row? Click here to see answer by checkley79(3050)

 Question 413428: Explain the advantages in having the meter officially defined in term of the distance light travel in a given time rather than as the length of a specific metal bar. (Physic home work) Click here to see answer by richard1234(5390)

 Question 413911: Hello again! thank you very much for looking at this question After watching a number of children playing games at a video arcade, a statistics practitioner estimated the following probability distribution of x, the number of games per visit: x 1 2 3 4 5 6 7 P(x) 0.05 0.15 0.15 0.25 0.2 0.1 0.1 - Determine the probability P(1 THANK YOU AGAIN! im really stressed out right now i missed my stats class and your the only ones who can help me! i really appreciate this thank you! Click here to see answer by jim_thompson5910(28595)

 Question 413961: determine weather the proprotion given below are true or false? 8/3 is to 9 as 4 is to 12 Click here to see answer by ewatrrr(10682)

 Question 413954: males with less than 4 years of highschool,14 ,4years of highschool only 25,some college(less than four years20.4 years college or more23 total 82 Females in the same order are 15,31,24,22 ,total 92 and the total for each is 20,56,44,45,and total of 174 These were in a chart but dont know how to enter a chart. Find the probability, expressed in a simplified fraction, that a randomly selected American, aged 25 or over 1. has not completed 4 yrs (or more) of college 2. has not completed 4 yrs of high school 3. has completed four years of high school only or less than 4 years of college 4. has completed less than 4 yrs of high school or four years of high school only 5. has completed 4 yrs of high school only or is a man 6. has completed 4 years of high school only or is a woman Click here to see answer by ewatrrr(10682)

 Question 414023: Three cards are drawn from a standard 52-card deck with replacement. What is the probability that all three cards are jacks? Click here to see answer by ewatrrr(10682)

 Question 414025: On a particular test, IQ scores for adults follow a bell-shaped (symmetric) distribution with mean=100 and a standard deviation of 15. In a random sample of 300 adults, approximately how many would have IQs of at least 85? Click here to see answer by ewatrrr(10682)

 Question 414022: Suppose that two cards are selected from a standard 52-card deck without replacement. A. Find the probability that exactly one card is a club B. Find the probability that both cards are kings C. Find the probability that exactly one card is a 7 D. Find the probability that at least one card is red E. Find the probability that neither card is a queen Click here to see answer by ewatrrr(10682)

 Question 414064: The probability experiment is to roll a pair of fair, labeled dice. The sample space for this experiment has 36 equally likely outcomes. Let Z=product of the "pips" on the upturned faces of the pair of dice. So, for instance, if you rolled a (6,4) or a (4,6) then Z=24 A. P[Z=4 or Z=12] B. P[Z less than or equal to 14] C. P[Z is an even number] D. P[Z is no more than 20] E. P[Z is at least 26] Click here to see answer by ewatrrr(10682)

 Question 414071: A class of 50 students obtained the following grades in a statistics course A 5, B 25, C 15, D5 If one student is selected at random, what is the probability that, a. the student obtained a B? b. the student obtained either B or a C? c. the student did not obtain a D? d. the student did not obtain a B or C? I am not sure were to start with this question, do I use the Tree diagram to help me? Thank you for you help Lorraine Click here to see answer by ewatrrr(10682)

 Question 414068: The probability of a defective pen in a large office building is 0.08. If a random sample of 30 telephones is selected, find the following probabilities, assuming this experiment is a binomial experiment. A. P[exactly 3 defective pens] B. P[at most 3 defective pens] C. P[no defective pens] D. Determine mean and variance For P[exactly 3] I came up with 0.219 and for P[at most 3] I came up with 0.784. Are these correct? Need help figuring out C and D. Thanks! Click here to see answer by ewatrrr(10682)

 Question 414101: mrs.helm's class can didvide into equal groups of 5 or groups of 6 student. which of the following is a possible size of her class Click here to see answer by ewatrrr(10682)

 Question 414210: The percentage of couples where both parties are in the labor force is 53.6. Choose 6 couples at random. Fine the probability that less than 2 of the couples have both parties working. My answer is .083. If this is not correct, please show me the formula needed to solve the answer. Thank you. Click here to see answer by stanbon(57377)

 Question 414314: If three cards are removed at random, one at a time without replacement, find the probability that at least one of the cards is a face card. Click here to see answer by sudhanshu_kmr(1152)
 Question 414314: If three cards are removed at random, one at a time without replacement, find the probability that at least one of the cards is a face card. Click here to see answer by ewatrrr(10682)

 Question 414313: If three cards are removed at random, one at a time without replacement, find the probability that at least one of the cards is a face card? Click here to see answer by ewatrrr(10682)

 Question 414344: A student takes a 10-question multiple choice exam and guesses on each question. (This means that the probability of success on any one question is the same.) Each question has 5 choices, only one of which is correct. Find the probability that the student fails the exam, i.e. scores <60%. Note this is a binomial experiment. Any help would be appreciated. Thanks! Click here to see answer by stanbon(57377)

 Question 414443: Here is my question, could you please show your work, ie. formula 1 card is randomly selected from a shuffled deck of 52 cards, and then a die is rolled, find the probability of obtaining a black card or a one.... Your help is greatly appreciated, Sam Click here to see answer by Alan3354(30993)

 Question 414461: in a bag of 4 yellow and 8 blue marbles. three are selected at random without replacement. what is the probabilitlity that all 3 are yellow or all 3 are blue? Click here to see answer by stanbon(57377)

 Question 414381: It is estimated that an average of 53% of college students graduate in 5 years or less. If 500 students on a large campus are selected at random, what is the probability that between 50% and 60% of them will graduate in 5 years or less? Click here to see answer by Edwin McCravy(8909)

 Question 414467: CRA CDs, Inc. wants the mean lengths of the “cuts” on a CD to be 135 seconds (2 minutes and 15 seconds). This will allow the disk jockeys to have plenty of time for commercials within each 10-minute segment. Assume the distribution of the length of the cuts follows the normal distribution with a standard deviation of 8 seconds. Suppose we select a sample of 16 cuts from various CDs sold by CRA CDs, Inc. What can we say about the shape of the distribution of the sample mean? A. What can we say about the shape of the distribution of the sample mean? B. What is the standard error of the mean? C. What percent of the samples will be greater than 128 minutes? D. What percent of the sample means will be greater than 128 but less than 140 minutes. Click here to see answer by stanbon(57377)

 Question 414490: A normal distribution of weekly income has a mean of \$250 and a standard deviation of \$20. Approximately what proportion of people earn between \$240 and \$260 a week? Click here to see answer by stanbon(57377)

 Question 414462: Given: mean is \$25 and standard deviation is \$8. Find dollar amount such that 80% of all customers spend atleast this amount. Click here to see answer by stanbon(57377)

 Question 414419: what is the probability of randomly selecting one card and getting a ten given taht the selected card is a spade? my trial: 4/52 + 13/52 Click here to see answer by Edwin McCravy(8909)

 Question 414531: An exam consists of 50 multiple choice questions. Based on how much you studied, for any given question, you think you have a probability of 0.64 of getting the correct answer. Consider the sampling distribution of the sample proportion of correct questions out of 50. find the STANDARD ERROR! Click here to see answer by stanbon(57377)

 Question 414581: Solve the linear system: 6x+6y= -24 , 2x+3y=-13 Answer to choose from The solution is : (-1,5) The solution is : (-2,5) The solution is : (-3,5) The solution is : (-4,5) Click here to see answer by mananth(12270)

 Question 414580: Find the zeros of f(x)=x^2-x-12. The zero of f(x) are? And? Answer to choose from The zeros of f(x) are 5 and 5 or 4 and 4 or 3 and 3 or 2 and 2 Click here to see answer by ewatrrr(10682)

 Question 414423: the result of an employee survey in response to a new company policy are shown below. use the given info. to answer the question ______opposed supported neutral total male : 25 24 10 59 female : 18 15 14 47 TOTAL : 43 39 24 106 now compute the probability of randomly selecting: a person who opposed the policy, given that the selected person is a female Click here to see answer by ewatrrr(10682)

 Question 414425: the result of an employee survey in response to a new company policy are shown below. use the given info. to answer the question. opposed supported neutral total male 25 24 10 59 female 18 15 14 47 TOTAL 43 39 24 106 now compute the probability of randomly selecting: two different females who opposed the policy Click here to see answer by ewatrrr(10682)

 Question 414422: the result of an employee survey in response to a new company policy are shown below. use the given info. to answer the question. opposed supported neutral total male 25 24 10 59 female 18 15 14 47 TOTAL 43 39 24 106 now compute the probability of randomly selecting: a male, given that the selected person supported the policy Click here to see answer by ewatrrr(10682)

 Question 414611: On days with a certain weather pattern, the probability of rain is 0.28. If today and tomorrow are days with this pattern, what is the probability that it will rain both days? Click here to see answer by ewatrrr(10682)

 Question 414610: A technology company estimates that the probability that its server will go down is 0.05, and the probability that the backup system will fail is 0.25. What is the probability that both systems fail? Click here to see answer by ewatrrr(10682)

 Question 414417: a fair die is rolled 3 times, what is the probability of not getting all sixes, and what is the probability of getting at least one six? my work: (5/6)*3 : (1/6)*3 Click here to see answer by stanbon(57377)

 Question 414698: please help me solve this problem...A sample of 4 different calculators is randomly selected from a group containing 41 that are defective and 22 that have no defects. What is the probability that all four of the calculators selected are defective? Round to four decimal places. Click here to see answer by sudhanshu_kmr(1152)

 Question 414768: How many arrangements of the letters in the word KNIGHTS are there? Click here to see answer by MathLover1(6634)

 Question 414767: how many arrangements of the letters in the word STATISTICS are there? Click here to see answer by MathLover1(6634)

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