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 602387: What are the possible outcomes of menu choices if I have 5 appetizers, 5 entrees, 5 drinks and 5 desserts? Would it be 5x5x5x5? So my answer would be 625 possible outcomes? Click here to see answer by jim_thompson5910(28598)

 Question 602455: I need your help with this question: Assuming that no questions are left unanswered, in how many ways can a five-question quiz with 5-choice multiple choice questions be answered? The quiz can be answered in ___ ways. Click here to see answer by jim_thompson5910(28598)

 Question 602487: Suppose X is subject to normal distribution with the population mean 7, and the standard deviation 2, what are the lower and upper values of X, located symmetrically around the mean, that will include 95% area under the curve? Click here to see answer by stanbon(57424)

 Question 602512: the working women executive magazine reports that 65% of all new female car buyers are women. Assuming that those figures are correct; find the probability that if we select six women at random that four women will be new car buyers Compute the probability by solving the binomial distribution formula the long way by hand. Click here to see answer by jim_thompson5910(28598)

 Question 602542: If a year is selected at random, find the probability that February has 31 days. Click here to see answer by jim_thompson5910(28598)

 Question 602524: A schoolteacher is concerned that her students watch more TV than the average American child. She reads that according to the American Academy of Pediatrics (AAP), the average American child watches 4 hours of TV per day (μ = 4.0 hours). She records the number of hours of TV each of her six students watch per day. The times (in hours) are 5.5, 4.4, 2.8, 2.5, 4.0, and 4.8. (a) Test the hypothesis that her students watch more TV than the average American child using a 0.05 level of significance and a one-independent sample t-test. State the value of the test statistic. (Round your answer to three decimal places.) Click here to see answer by stanbon(57424)

 Question 602613: out of 7 books on a shelf how many groups of 3 can be made Click here to see answer by jim_thompson5910(28598)

 Question 559566: Assuming a normal die with six sides, we will define Event A: you roll the die and it’s even. We will define Event B: you roll the die and it is less than 5. Calculate the probabilities for the next 2 questions. 6) Roll the dice once. What is the probability that Event A will occur given that Event B has already occurred? 7) Roll the dice once. What is the probability that Event B will occur given that Event A has already occurred? Click here to see answer by nathan1234(1)

 Question 602666: An unprepared student makes random guesses for 6 multiple choice questions that have selections a - e. Find the probability that there is at least one correct answer. Click here to see answer by stanbon(57424)

 Question 602704: 429 students were surveyed. 175 had a cat. 33 had a dog. 24 had both a cat and a dog what is the probability that a student had a cat or a dog Click here to see answer by AnlytcPhil(1278)

 Question 602745: find the probability that at least 2 juniors are picked for a 3 member board when 8 juniors and 5 seniors are available. Click here to see answer by stanbon(57424)

 Question 602833: What is the variance of the following data? If necessary, round your answer to two decimal places. 48, 65, 57, 54, 61, 57, 52, 61, 57 Click here to see answer by AnlytcPhil(1278)

 Question 274226: The Cincinnati Enquirer, in its Sunday business supplement, reported that the mean number of hours worked per week by those employed full time is 43.9. The article further indicated that about one-third of those employed full time work less than 40 hours per week. (a) Given this information and assuming that number of hours worked follows the normal distribution, what is the standard deviation of the number of hours worked? (b-1) The article also indicated that 20 percent of those working full time work more than 49 hours per week. Determine the standard deviation with this information. (b-2) Are the two estimates of the standard deviation similar? Click here to see answer by sojazzy80(1)

 Question 602841: Generate a frequency distribution of the data for both using Microsoft® Excel Explain How the frequency distribution might be used to better understand and improve the inventory system For Lam Research Corporation Currency and currency equals, short-range savings and limited currency and savings balance remained \$2.6 billion at the conclusion of the March 2012 quarterly records, connected to \$2.4 billion at the conclusion of the December 2011 quarterly records. The increase in currency and currency equals, short-range savings and limited currency and savings balances throughout the quarter primarily on the account of functioning events and the currency payment of a share repo arrangement that did not execute. Cash flows from functioning events were about \$146.4 million through the March 2012 quarterly report. Delayed returns and delayed revenue net at the completion of the March 2012 quarterly report increased to \$246.2 million and \$139.6 million, consistently. Lam Research postponed returns net exclude deliveries to Japanese clienteles, where name does not transfer pending client approval. Deliveries to Japanese clienteles are categorized as inventory at cost pending the time of approval. The predictable forthcoming return from deliveries to Japanese clienteles was nearly \$18.5 million as of March 25, 2012. Future Inventory Costs Source: S&P Capital IQ. Data is current as of latest fully reported quarter. Dollar amounts in millions. FY = fiscal year. TTM = trailing 12 months Source: S&P Capital IQ. Data is current as of latest fully reported quarter. Dollar amounts in millions. FQ = fiscal quarter Trailing 12-month revenue decreased 6.0%, and inventory increased 11.8%. Over the sequential quarterly period, the trend looks disappointing. Revenue dropped 14.2%, and inventory dropped 5.8%. On a trailing 12-month basis, raw materials inventory was the fastest growing segment, up 26.4%. On a sequential quarter basis, raw materials inventory was also the fastest-growing segment; up 2.1%. Although Lam Research shows inventory growth that outpaces revenue growth, the company may also display positive inventory divergence, suggesting that management sees increased demand on the horizon. Click here to see answer by babaea123(2)

 Question 602850: a container holds 4 green chips, 7 blue chips, and 5 red chips. Without looking, Mark selects a green chips and places it back in the container. What is the probability that rosa will select a green chip? Click here to see answer by richard1234(5390)

 Question 602771: The probability that Pete will catch fish on a particular day when he goes fishing is .8. Pete is going fishing 3 days next week. The probability that Pete will catch fish on two or more days is? Click here to see answer by scott8148(6628)

 Question 603049: A box of 140 marbles contains only red, green, and blue marbles. There are three times as many green marbles as red marbles. There are six times times as many blue marbles as red marbles. How many blue marbles are there in the box? Click here to see answer by stanbon(57424)

 Question 603043: In San Francisco, 30% of workers take public transportation daily. Consider a random sample of 10 workers. Find the probability that at least 3 workers take public transportation daily. Find the probability that fewer than 2 workers take public transportation daily. Find the probability that more than 6 workers take public transportation daily. find the probability that at most 2 workers take public transportation daily. Click here to see answer by stanbon(57424)

 Question 603105: Determine the probability of p(x>108) with a mean of 100 and a standard deviation of 8 Click here to see answer by stanbon(57424)

 Question 603135: what is the measure of a central angle that represents 25% of the circle? Click here to see answer by Alan3354(30993)

 Question 603156: start with x=75 and add four x values to make a sample of five data such that the standard deviation of these data equals 0. Click here to see answer by stanbon(57424)

 Question 603132: a vocal quartet has a soprano, an alto,a tenor, and a bass. if two of the singers are going to perform a duet, how many different combinations of two singers are possible? Click here to see answer by stanbon(57424)

 Question 603130: michele flips a coin and tosses a 6 sided number cube. what is the probability that the coin lands tails and 3 comes up on the number cube? Click here to see answer by stanbon(57424)

 Question 481027: Popular TV Shows Let U = {60 Minutes, American Idol–Tues., American Idol–Wed., CSI, CSI: Miami, Desperate Housewives, Friends, Grey’s Anatomy, Law & Order, The Apprentice}. Sets A, B, and C that follow show the five most watched television shows for the years 2004, 2005, and 2006, respectively (according to Nielsen Media Research). Then A = {CSI, American Idol–Tues., American Idol–Wed., Friends, The Apprentice} B = {CSI, American Idol–Tues., American Idol–Wed., Desperate Housewives, CSI: Miami} C = {American Idol–Tues., American Idol–Wed., CSI, Desperate Housewives, Grey’s Anatomy} Construct a Venn diagram illustrating the sets. Click here to see answer by katielreed(1)

 Question 603128: bill has 25 red tiles, 10 green tiles, and 15 blue tiles. he selects a tile at random, returns it, and selects a second tile. what is the probability that the first tile is blue and the second tile is green? Click here to see answer by stanbon(57424)

 Question 603125: two number cubes were tossed each with numbers 1 through 6. what is the probability that the first cube will show a number less than 2 and the second will show a number greater than 2? Click here to see answer by stanbon(57424)

 Question 603224: A set of scores has a mean of 50 and a variance of 4. What is the standard deviation for this distribution? Click here to see answer by stanbon(57424)

 Question 603313: suppose a person rolls a die 5 times and gets a 5 every single time. Suppose the die is rolled a sixth time, what is the probability that another 5 comes up? I figured the sixth die would be 1 out of 6. The answer seems too easy. I'm horrible in math so when an answer seems too easy, usually it's wrong. Click here to see answer by bucky(2189)
 Question 603313: suppose a person rolls a die 5 times and gets a 5 every single time. Suppose the die is rolled a sixth time, what is the probability that another 5 comes up? I figured the sixth die would be 1 out of 6. The answer seems too easy. I'm horrible in math so when an answer seems too easy, usually it's wrong. Click here to see answer by scott8148(6628)

 Question 603457: A company takes a sample of 20 boxes of cereal from their production line.they believe that of the 20 boxes, four will have too little cereal in them and sixteen willhave the correct amount.the company then randomly selects three of the boxes from the twenty and weighs them.assuming the company is correct about the number of light boxes, find the probability that the three boxes selected will all have the correct amount. I tried to do the binomial probability equation and I ended up with a large number. Please help. Click here to see answer by solver91311(16897)

 Question 603486: A pair of dice is rolled three times. Find the probability that at least two sums are 7. I am trying to figure out if I should use combinations or not and how to consider that it says at least. Click here to see answer by scott8148(6628)

 Question 603690: What is the probability that i will choose a face card given that i chose a heart card ? What is the probability that a couple has three boys and two girls ? What is the probability that i will choose a face and a heart card ? What is the probability that i will choose a face or a heart card ? What is the probability that a couple has two boys and three girls ? Click here to see answer by stanbon(57424)

 Question 603832: in 540 spins how many yellows can you get from a 6 sided spinner with 3 yellows? Click here to see answer by Alan3354(30993)

 Question 603928: How many subsets of four elements can be made from a set of ten elements? A. 5,040 B. 40 C. 210 D. 1,260 Click here to see answer by stanbon(57424)

 Question 603932: Tom and Carl start 200 miles apart, running towards each other. Tom runs 5 miles per hour faster than Carl. If they meet after 10 hours, how fast are they running? A. 10 mph and 15 mph B. 15 mph and 20 mph C. 2.5 mph and 7.5 mph D. 7.5 mph and 12.5 mph Click here to see answer by ewatrrr(10682)