From the past experience, 70% of the stocks are profitable. What is the probability that 5 of the 8 stocks are profitable? Find the mean and standard deviation of the random variable X, where X is the number of profitable stocks out of 8.
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Q: From the past experience, 60% of the stocks are profitable. What is the probability that 5of the 7…
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- The weights of steers in a herd are distributed normally. The variance is 40,000and the mean steer weight is 1000lbs. Find the probability that the weight of a randomly selected steer is greater than 600lbs. Round your answer to four decimal places.A professor of statistics noticed that the marks in his course are normally distributed. He also noticed that his morning classes average 73% with a standard deviation of 12% on their final exams. His afternoon classes average 79% with a standard deviation of 11%. A. What is the probability that a randomly selected student in the morning class has a higher final exam mark than a randomly selected student from an afternoon class? Probability = B. What is the probability that the mean mark of four randomly selected students from a morning class is greater than the average mark of four randomly selected students from an afternoon class? Probability =The weights of steers in a herd are distributed normally. The variance is 10,000 and the mean steer weight is 1100lbs. Find the probability that the weight of a randomly selected steer is between 919 and 1180lbs. Round your answer to four decimal places.
- Solve the last part what is the source of variability in the random variable? B. The sample size was weing60% of all the students passed an exam. If a random sample of 10 students is selected, What is the mean and the standard deviation ?In the winter, guests who visit Yosemite National Park like to stay at an overnight lodge in the park 71 % of the time. Find the probability that among 11 guests surveyed exactly 3 guests like to stay at an overnight lodge in the park. P(x = 3) =
- In a Calculus class, the final exam scores were normally distributed with a mean of 63 and a standard deviation of 5. If you are randomly selected, what is the probability that you will score more than 65 on the exam? Identify the type of probability distribution shown in the problem Identify the given in the problem and solve for the probability.80% of beans seeds sprout. Three seeds were planted. Find the distribution of the variable X = number of seeds that sprout. Find its mean value, variation and the probability that (a) at least two seeds sprout, (b) no one. [Ans.0, 816; 0, 008 ]Citizens use an average of 650 pounds of paper a year. Suppose that the distribution is normal with a population standard deviation of 153.5 pounds. Suppose you take a random sample of 25 Citizens. What is the probability that the mean pounds of paper used in a year are between 500 and 700 pounds
- Cody took his first physics exam and scored an 80. The population mean for this exam is 70, and the standard deviation is 5. What is the probability of selecting a person with a score greater than Cody’s?You have a uniform distribution whose lowest value is 7 and whose highest value is 15. Find the probability that a randomly selected number from this distribution will be between 9.3 and 10.6.A racing car consumes a mean of 103 gallons of gas per race with a variance of 36. If 38 racing cars are randomly selected, what is the probability that the sample mean would differ from the population mean by more than 2 gallons? Round your answer to four decimal places.