what is the probability that when taking a sample without replacement of size 28, 12 students are connected from room CS103?
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- Suppose three balls are drawn (with replacement) from a bag that contains 4 green balls and 5 black balls. The number of black balls is counted. What is the expected number of black balls in the sample? Thank you!If 2% of a population has a genetic mutation and 100 people are randomly selected what is the mean for the number of people with the genetic mutation is such groups of 100?An urn consists of 30 red balls and 70 green balls. What is the probability of getting exactly k red balls in a sample of size 20 if the sampling is done without replacement (repetition not allowed)?
- 100 among 600 articles are defective. If the maximum error with probability 0.99 is 0.02. Find the sample size.Suppose that the average number of typos on a page of a manuscript is 6.93. What is the probability that there are seven typos on a certain page?A psychology class consists of48 males and 62 females. If the professor selects names from the class using random sampling: (solve as random sampling without replacement) What is the probability that the first student selected will be a male? If a random sample of n = students is selected and the first three are both females, what is the probability that the last two student selected will be a male Show word count (Previous
- Find the probability that the sample mean of Xbar = 20 hours, as observed here, less than or equal 20 hours could arise if the true mean of the lotAccording to the statistics, 13% of cars in the city were at least 12 years old in2004. Assume that this result holds true for the current population of all cars in thecity. Random sample of 500 cars are selected at random. Approximate the probabilitythat 80 to 98 cars are at least 12 years old?dentical relay stations at different locations. During те cошрапу оpeгates thr Review Exercises 2.103 A truth serum has the property that 90% o the guilty suspects are properly judged while, of course 10% of the guilty suspects are improperly found inno- cent. On the other hand, innocent suspects are mis- judged 1% of the time. If the suspect was selected from a group of suspects of which only 5% have ever committed a crime, and the serum indicates that he is guilty, what is the probability that he is innocent? 2.104 An allergist claims that 50% of the patients she tests are allergic to some type of weed. What is the probability that (a) exactly 3 of her next 4 patients are allergic to weeds? th natients is allergic to weeds?
- A box contains 8 balls. One is numbered 2, two are numbered 3, one is numbered 4, and four are numbered 5. The balls are mixed and one is selected at random. After a ball is selected, its number is recorded. Then it is replaced. If the experiment is repeated many times, find the variance of the numbers on the balls. (Round off your final answer to 2 decimal places).How many different simple random samples of size 5 can be obtained from a population whose size is 38? The number of simple random samples which can be obtained is ???Suppose that there is a 15% chance that a randomly selected Stat 240 student wears glasses. Out of a class with 35 students, what is the minimum number of students wearing glasses for the percent to be considered unusually high? Thanks!
