# 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 586040: 1. It is asserted that 65 percent of the cars approaching an individual toll both in New Jersey are equipped with an E-ZPass transponder. Find the probability that in a sample of seven cars: (a) All seven will have the transponder. (Round your answer to 4 decimal places.) Probability (b) At least four will have the transponder. (Round your answer to 4 decimal places.) Probability (c) None will have a transponder. (Round your answer to 6 decimal places.) Probability Click here to see answer by stanbon(57214)

 Question 586054: from the perspective of insurance company health policies are set up in such a way a healthy person has a negative expected value and a sickly person a positive one. Right or Wrong Click here to see answer by stanbon(57214)

 Question 586058: If each in a set of scores is increased by 5 points, then how will this affect the median, mode and mean of the scores? Click here to see answer by stanbon(57214)

 Question 585973: If a thumbtack is dropped, the probability of it landing point up is .4. If 12 tacks are dropped, find the probability of at least 9 points up in fraction form Click here to see answer by stanbon(57214)

 Question 586157: Terry took for quizzes . Her scores were 16,17,15and 20.what was the range of her scores? Click here to see answer by rfer(12644)

 Question 586186: a card is drawn from a standard deck of 52 cards.find the probability that the card is either a ten or a club Click here to see answer by edjones(7569)

 Question 586128: There were600 cars of that amount 1/3 were red blue cars made 25% of the total the remaining cars were green how many green cars were there Click here to see answer by rfer(12644)

 Question 586220: Suppose we are testing the hypotheses H0 : u=100 versus Ha : u<100. Which sample mean will have the smaller p-value, X bar=90 or X bar=85? Select all that apply. Assume std. Deviation is the same. A. X bar=85 will have a smaller p-value because it's furthest from (null) u0=100 B. X bar=90 will have a smaller p-value because it's closer to (null) u0=100 C. X bar=85 will have a smaller p-value because it provides more support for Ha. D. X bar= 90 will have a smaller p-value because it provides more support for Ha. *it can be any combination of the following answers, more than 1 may be right Click here to see answer by stanbon(57214)

 Question 586158: Flip a coin until you get a head or 3 consecutive tails; record each flip. I'm not sure how to answer this question Click here to see answer by stanbon(57214)

 Question 586391: I'm trying to do my math homework but im getting every question wrong, so if you can show me the work to this i think i will understand the others... Thank You! Sammy's batting average this season is 0.225. What is the probability that Sammy will get hits his next two times at bat? Express your answer as a decimal rounded to the nearest thousanth. Click here to see answer by richwmiller(9135)

 Question 586434: Mike has a bag of 300 balls he randomly chooses 15 balls and 4 are purple how many of the 300 balls are probably purple Click here to see answer by stanbon(57214)

 Question 586436: There were 20 multiple choice questions, each of which had only one correct answer from 4 choices. Assuming that she guesses on all 20 questions what is the probability that: A. Get all 20 right? B. Get exactly 14 questions (70%) right? C. Get at least 12 questions right? D. Get at least 14 questions right? Click here to see answer by stanbon(57214)

 Question 586393: Choose the value below that is the Median (to two decimal places). (Points : 8) Median: 15.17 Median: 12.18 Median: 4.87 Median: 6.27 Click here to see answer by stanbon(57214)

 Question 586450: a cd rack has 8 classical cds, 5 pop cds and 3 rock cds. two cds are chosen without replacement. what is the probability of choosing a rock cd then a classical cd? Click here to see answer by stanbon(57214)

 Question 586454: Weights of bear cubs in maine are approximately normally distributed with a mean of 42.3 pounds and standard deviation of 6.8 pounds. Let X be the weight of a bear cub checked during this year's bear count. What is the probability that: A. X<45 B. X>42 C. 40 Click here to see answer by stanbon(57214)

 Question 586452: Three unbiased 6 sided dice would be rolled at the same time. Each die had a W stamped on 3 sides and 3 sides that were plain. It would cost \$1.00 to play and a player would receive \$0.50 for each W they get. A. What is the sample space for possible outcomes? B. What is the expected value (how much would you expect to win or lose on average? Click here to see answer by stanbon(57214)

 Question 586508: A study of health care planning undertook a mail survey of hospital administrators in Arkansas, Louisiana, and east Texas. Research question: At α = .05, is the type of planning independent of the intensity of competition? (Data are from D. O. McKee, P. R. Varadarajan, and J. Vassar, “A Taxonomy of Marketing Planning Styles,” Journal of the Academy of Marketing Science 18, no. 2 [Spring 1990], pp. 131–41.) Planning Degree of Limited Constituency Comprehensive Competition Planning Planning Planning Row Total Low 11 25 33 69 Moderate 19 23 15 57 High 43 25 17 85 Col Total 73 73 65 211 Click here to see answer by stanbon(57214)

 Question 586525: If b and w stand for the results of a throw of two dice, show that the events A = {b +w < 8} and B = {b = 3 or 4} are statistically independent (although it is difficult to see why they should be in the usual sense of the word) Click here to see answer by stanbon(57214)

 Question 586506: A student had to find a certain angle 0. The student got to the line sin=5/2 and knew that he had made a mistake and why his calculator would have given him an error message if he tried to continue. Click here to see answer by stanbon(57214)

 Question 586366: What is the probability of having two aces, two kings, and a queen in a five-card poker hand? Click here to see answer by stanbon(57214)

 Question 586599: There are 11 boys and 7 girls in a class. How many groups of 5 students can be made with exactly 3 girls in them? I got 1,925 and wanted to know if that was correct Click here to see answer by solver91311(16868)

 Question 586710: each strokes of a vacuum pump extracts 5% of the air remaining in the container.what decimal fraction of the original air remains after 50 strokes? Click here to see answer by stanbon(57214)

 Question 586713: The average number of turkeys per flock in Kennebec County is 38 with a standard deviation of 4. A. What size flock would have a z score of --1.5? B. What percent of flocks would have expected to be smaller than A)? Click here to see answer by stanbon(57214)

 Question 586714: A new fluorescent light to replace incandescent bulbs has come on the market. The box says life of 8,000 hours with a standard deviation of 750 hours. A random sample of 50 light bulbs is taken. Let Xbar be the mean of the sample. A. What is the probability that Xbar is >or equal to 7900? Click here to see answer by stanbon(57214)

 Question 586735: a number from the following list is chosen at random 11,91,63,5,39,41, and 71. Describe the probability of picking an even number Click here to see answer by ad_alta(240)

 Question 586708: In a sporting game, shots are fired at a certain domain D, consisting of three non-overlapping zones. The probability of hitting zone I is 0.05. The probabilities of hitting zones II and III are 0.1 and 0.17 respectively. What is the probability of hitting D? Click here to see answer by ad_alta(240)

 Question 587077: Suppose the chances of picking up a cold from someone by shaking hands with them is .01 (assuming you dont know whether they have a cold or not), and that each encounter you have is independent of another. Suppose you shake hands with 5 people in a given day. What is the probability that you dont pick up a cold from any of these people? Click here to see answer by stanbon(57214)

 Question 587079: Suppose you have a taxing policy where 60% of the population pays \$10,000 per year in taxes per person, and the other 40% pays \$100 per year in taxes per person. What is the expected value for the amount of yearly taxes paid by one person in this population? Click here to see answer by stanbon(57214)

 Question 587075: Suppose a population contains 100,000 individuals, of which 500 are carriers of a certain genetic defect. Which, if any, of the following is NOT an appropriate way to express this result as a portion of the total? Why?! A- One half of one percent (.5%)of all individuals in this population are carriers. B-The proportion in this population who are carriers is .005 C- The probability that a person randomly selected from this population carrier is .5% D- All of the above are appropriate. Click here to see answer by stanbon(57214)

 Question 587027: A bag contains 12 red marbles, 10 green marbles,2 yellow marbles, 19 blue marbles, and 9 purple marbles. What is the probability of pulling out a green marble? Click here to see answer by stanbon(57214)

 Question 586998: IF P(F)= 0.30, P(E or F)= 0.65, and P(E and F)=0.15 find P(E) Click here to see answer by stanbon(57214)

 Question 587095: Two students take a college entrance exam known to have a normal distribution of scores. The students receive raw scores of 74 and 94, which correspond to z scores (often called the standardized scores) of -1 and 2.0, respectively. Find the mean and standard deviation of the distribution of raw exam scores. (Use five decimal places in the intermediate calculations. Round your final answers to 4 decimal places.) Click here to see answer by stanbon(57214)

 Question 587104: Suppose a class of about 100 students took their statistics final and their grades are shown in the table below A, B, C, D, F 25, 28, 34, 10, 3 a- Choose one student at random. What is the probability that he or she received a B or a C?! b- What is the probability that a student selected at random passed the final (where D is considered to be a passing grade) Click here to see answer by stanbon(57214)

 Question 587162: If you roll two dice. What are the odds of getting numbers that add up to 6? Click here to see answer by edjones(7569)

 Question 587146: a bag contains 5 red marbles and 10 blue marbles. what is the probability that the two marbles drawn from the bag (randomly without replacement) will both be blue? Click here to see answer by edjones(7569)

 Question 587144: a four-sided fair die has faces labeled 1,2,3, and 4. what is the probability of rolling a sum of 8 with a toss of 2 such dice? Click here to see answer by edjones(7569)

 Question 587136: A box contains 5 white balls, 3 black balls, and 2 red balls. A-What is the probability of drawing a white ball? B- How many white balls must be added to the box so that the probability of drawing a white ball is 3/4? C-How many black balls must be added to the original assortment so that the probability of drawing a white ball is 1/4? Please help me with this! Click here to see answer by edjones(7569)

 Question 587094: A box contains 5 colored balls and 4 white balls. If three balls are drawn one by one, find the probability that they are all white if the draws are made as follows: A- with replacement B- without replacement Click here to see answer by edjones(7569)

 Question 587093: An electric clock is stopped by a power failure. What is the probability that the second hand is stopped between the marks for the 3 and the 4. ( Assume that the second hand moves smoothly around the click, not jumping from mark to mark) Click here to see answer by edjones(7569)

 Question 587123: A card is drawn from a regular deck of 52 cards. Let A be the event "the card is a club" Let B be the event "the card is red" Let C be the event "the card is a six" a- Find P(A), The probability that the card drawn is a club. b-Using vocabulary of the cards, such as in the definitions of the events, write in words the meaning of the event A "FLIPPED U" C (A and C) and find P(A "FLIPPED U" C). ["FLIPPED U" is the symbol for intersection] c- Using the vocabulary of the cards, write in words the meaning of the event B U C, (B or C) and find P(B U C). [U is the symbol for union] Click here to see answer by edjones(7569)

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