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

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Question 574251: If you may please answer the below question:-
If 3 teams play 8 matches with each other, what will be the total number of matches played ?
Click here to see answer by stanbon(57246)

Question 574231: for the standard normal distribution of a random variable Z determine P(Z<1.3)

Click here to see answer by stanbon(57246)

Question 574213: Batteries for torch lights are packed in boxes of 10 and a lot contains 10 boxes. A quality inspector randomly chooses a box and then checks two batteries selected randomly without replacement from that box. The lot will be rejected if any one of the two chosen batteries turns out to be defective. Suppose that 9 of the 10 boxes in the lot contain no defective batteries and only one box contains 2 defective ones. What is the probability that the lot will NOT be passed by the Inspector?
Click here to see answer by stanbon(57246)

Question 574212: A private medical clinic wants to estimate the true mean annual income of its patients. The clinic needs to be within $100 of the true mean. The clinic estimates that the true population standard deviation is around $2,100. If the confidence level is 95%, find the required sample size in order to meet the desired accuracy.
Click here to see answer by stanbon(57246)

Question 574210: How is it written in a probability form, this question. If a family wants 3 kids, what are their chances of having at least one boy?
Click here to see answer by stanbon(57246)

Question 574195: Suppose you are going to visit a village that has 120 males (70 boys and 50 men), and 140 females (80 girls and 60 women). What would the probability for you to run into three girls in a row?
Click here to see answer by stanbon(57246)

Question 574299: Explain what is wrong and why it is wrong.
The day before a big election, a pre-election survey showed that Candidate A got 52% and Candidate B got 48%. The margin of error is 3%. If nothing changes Candidate A will win
Click here to see answer by josmiceli(9661)

Question 574385: Define the following two events for two tosses of a coin:
A = at least one head is obtained
B = both tails are obtained
Are A and B complementary events?
If yes, first calculate the probability of B and then calculate the probability of A using the complementary event rule.
Click here to see answer by stanbon(57246)

Question 574373: refer to the following information.
About 60% of adults get less than the recommended 8 hours of sleep per night according to a study conducted by the University of Washington.
In a random sample of 7 adults,
a) what is the expected number of them that get less than the recommended 8 hours of sleep per night? (That is, find the mean.)
b) what is the standard deviation of this distribution?

Click here to see answer by stanbon(57246)

Question 574343: The stem-and-leaf plot represents the average monthly high temperatures in Tampa, Florida. What is the median of the temperatures? Round to the nearest tenth. Stem:6 Leaf: 9 Stem: 7 Leaf: 1267 Stem: 8 Leaf: 14799 Stem: 9 Leaf: 00
Click here to see answer by stanbon(57246)

Question 574399: In one town, 53% of all voters are democrates. If two are randomly selected for a survey, find the probability that they are both democrats.
Click here to see answer by reviewermath(507)

Question 574404: A study conducted at a certain college shows that 53% of the schools graduates find a job a year after graduation. Find the probability among 7 randomly selected, at least one finds a job within a year after graduation.
Click here to see answer by stanbon(57246)

Question 574400: I have two devices packaged together and each individual device yields 70%
I need to know what the probability is that at least one of them will be good when I open the package to use them
Click here to see answer by stanbon(57246)

Question 574449: which pair has equally likely outcomes: a.rolling a sum of 7 on two fair six sided dice, b.drawing a spade out of a standard 52 card deck, c.drawing a sween out of a standard 52 card deck given its a face card, d.drawing a red card out of a standard 52 card deck, e.rolling a 4,5,or 6 on one fair six sided die?
Click here to see answer by stanbon(57246)

Question 574443: 6. A very short quiz has one multiple-choice question with five possible choices (a, b, c, d, e) and one true or false question. Assume you are taking the quiz but do not have any idea what the correct answer is to either question, but you mark an answer anyway.
a. What is the probability that you have given the correct answer to both questions?
b. What is the probability that only one of the two answers is correct?
c. What is the probability that neither answer is correct?
d. What is the probability that only your answer to the multiple-choice question is correct?
e. What is the probability that you have only answered the true or false question correctly?

Click here to see answer by stanbon(57246)

Question 574452: A game consists of rolling a pair of dice. If the sum is either 6,7 or 8 you win $5.00 otherwise you win $1.00.
Find the expected value for this game. Show your calculations in detail.
Click here to see answer by stanbon(57246)

Question 574442: 7.Ten percent of the items produced by a machine are defective. Out of 15 items chosen at random, [20 Marks]
a. what is the probability that exactly 3 items will be defective?
b. what is the probability that less than 3 items will be defective?
c. what is the probability that exactly 11 items will be non-defective?

Click here to see answer by stanbon(57246)

Question 574455: What is the variance and standard deviation (of profit, NOT of battery life) for producing an NiMH battery?
Click here to see answer by richard1234(5390)

Question 574579: Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform distribution. Find the probability of the given range of pounds lost. Less than 9 pounds
Click here to see answer by stanbon(57246)

Question 574577: A company purchases shipments of machine components and uses this acceptance sampling plan: Randomly select and test 21 components and accept the whole batch if there are fewer than 3 defectives. If a particular shipment of thousands of components actually has a 6% rate of defects, what is the probability that this whole shipment will be accepted
Click here to see answer by stanbon(57246)

Question 574576: A machine has 9 identical components which function independently. The probability that a component will fail is 0.2. The machine will stop working if more than three components fail. Find the probability that the machine will be working.
Click here to see answer by stanbon(57246)

Question 574574: I really need help!!! thanks Suppose we want to estimate the average number of purchases in a given hour in a local convenience store. Using this example, describe how you would go about determining this average through:
a. Drawing a random sample
b. Drawing a systematic sample
c. Drawing a convenience sample
Click here to see answer by stanbon(57246)

Question 574586: a die is rolled twenty times.What is the probability of getting exactly four two's?
Click here to see answer by jim_thompson5910(28504)

Question 574589: Given that P(A)=0.4 and P(B)=0.5, and P(A and B)=0.16, determine P(B/A)
Click here to see answer by jim_thompson5910(28504)

Question 574591: An identification code is to consist of seven letters followed by two digits. How many different codes are possible if repetition is permitted?
Click here to see answer by jim_thompson5910(28504)

Question 574593: Evaluate: 5C3
Click here to see answer by jim_thompson5910(28504)

Question 574595: Sow all work. Mary purchased a package of 18 different plants, but she only needed 12 plants for planting. In how many ways can she select the 12 plants from the package to be planted?
Click here to see answer by jim_thompson5910(28504)

Question 574592: Show all work. A disc jockey has 7 songs to play. 5 are slow songs, and 2 are fast songs. each song is to be played only once. In how many ways can the disc jockey play the 7 songs if:
a)the songs can be played in any order
b)the first song must be a slow song and the last song must be a slow song
c)the first two songs must be fast songs

Click here to see answer by stanbon(57246)

Question 277508: From a group of 100 students, 30 are taking math, 20 are taking chemistry, and of those totals 10 are taking both math and chemistry.What is the probability that a randomly selected student is taking math or chemistry?
Click here to see answer by yuckypants(1)

Question 574629: use any three of the digits 2,3,4 and 6 to form an 8 digit factor and a two didgit factor with a estimated product that is between 140 and 250
Click here to see answer by Edwin McCravy(8882)

Question 574636: It is estimated that on a professor's statistics exam, four fifths of the students pass. Suppose a class has 43 students.
What is the probability that exactly 30 students pass?
Click here to see answer by reviewermath(507)

Question 574637: It is estimated that on a professor's statistics exam, four fifth of the students pass. Suppose a class has 43 students.
What is the probability that exactly 30 students pass?
Click here to see answer by reviewermath(507)

Question 574660: Suppose that x has a binomial distribution with n = 15 and p = 0.3. Is the normal approximation reasonable for this binomial distribution?
Click here to see answer by Edwin McCravy(8882)

Question 574676: evaluate 10C2
Click here to see answer by solver91311(16868)

Question 574672: probability that a couple who has brown eyes have a child with blue eyes
Click here to see answer by solver91311(16868)

Question 574672: probability that a couple who has brown eyes have a child with blue eyes
Click here to see answer by richard1234(5390)

Question 574764: A bag contains13 balls numbered 1 through 13. What is the probability that a randomly selected ball has an even number?
My answer = 6/13
Thank you.
Click here to see answer by ad_alta(240)

Question 574671: a. Solve for x
b. solve for y
c. Solve for z
3x+7=(4y/z)^2
i really need the work shown also because i have no idea what order of operations is on these. thank you so much

Click here to see answer by ankor@dixie-net.com(15638)

Question 574831: Two fair 6-sided dice are rolled. What is the probability the sum of the two numbers on the dice is 3?
Click here to see answer by Edwin McCravy(8882)

Question 574835: A number cube labeled with numbers 1, 2, 3, 4, 5 and 6 is tossed. What are the odds in favor of the cube showing an odd number?
My answer = 1:2
Thanks.
Click here to see answer by richard1234(5390)

Question 575024: A meteorologist reported an 82% chance the weather would be sunny and a 74% chance it would be sunny and that the temperature would get over 85 °F. If it is a sunny day, what is the probability the temperature will also be more than 85 °F?
a. 31.7%
b. 18.0%
c. 90.2%
d. 74.0%
Click here to see answer by reviewermath(507)

Question 574863: If a person is randomly selected, find the probability that his/her birthday is in May. Ignore leap years. Assume that all days of the year are equally likely for a given birth.
My answer = 1/365 or 1/12?
Thank you very much!
Click here to see answer by sudhanshu_kmr(1152)

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