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Expected Life The expected life of blue whales follows a distribution with mean 75 and standard...
Question 5 2 pts An unknown distribution has a mean of 75 and a standard deviation...
Question 5 2 pts An unknown distribution has a mean of 75 and a standard deviation of 18. Samples of size n-30 are drawn randomly from the population. Find the probability that the sample mean is between 80 and 85. (round to 4 decimal places) Example page 397 Wk6Hw_Smp Mean3
The life expectancy in the United States is 75 with a standard deviation of 7 years....
The life expectancy in the United States is 75 with a standard deviation of 7 years. A random sample of 49 individuals is selected. Round all probabilities to four decimal places. What is the probability that the sample mean will be larger than 77 years? Answer What is the probability that the sample mean will be within 1 year of the population mean? What is the probability that the sample mean will be within 2.5 years of the population mean?
A normal population has a mean of 75 and a standard deviation of 5. You select...
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Use Appendix B1 for the z values Compute the probability that the sample mean is: (Round the zvalues to 2 decimal places and the final answers to 4 decimal places.) a. Less than 74 Probability 09 b. Between 74 and 76. Probability c. Between 76 and 77 Probability d. Greater than 77 Probability Not > 3 of 4 < Prey...
The final exam grade of a statistics class has a skewed distribution with mean of 76...
The final exam grade of a statistics class has a skewed distribution with mean of 76 and standard deviation of 7.4. If a random sample of 36 students selected from this class, then what is the probability that the average final exam grade of this sample is between 75 and 80? Answer: (keep 4 decimal places)
A population has a mean μ-85 and a standard deviation σ-21. Find the mean and standard...
A population has a mean μ-85 and a standard deviation σ-21. Find the mean and standard deviation of a sampling distribution of sample means with sample size n 49 H(Simplity your answer) o-# L] (Simplify your answer.) to the random variable x is normally distributed with mean-83 and standard deviation ơ-4 Find the indicated probability P(70sx 76) P(70 < x < 76)= Round to four decimal places as needed.) Enter your answer in the answer box
Power+, produces AA batteries used in remote-controlled toy cars. The mean life of these batteries follows...
Power+, produces AA batteries used in remote-controlled toy cars. The mean life of these batteries follows the normal probability distribution with a mean of 32 hours and a standard deviation of 5.2 hours. As a part of its testing program, Power+ tests samples of 36 batteries. Use Appendix B.1 for the z-values. a. What can you say about the shape of the distribution of sample mean? b. What is the standard error of the distribution of the sample mean? (Round...
7) In a normal distribution with μ=14 and σ=2, find the mean of the distribution of...
7) In a normal distribution with μ=14 and σ=2, find the mean of the distribution of sample means for samples of size 25. 8) In a normal distribution with μ=12 and σ=0.75, find the standard deviation of the distribution of sample means for samples of size 64. (Round to the nearest ten-thousandth.) 11)Your company manufactures hot water heaters. The life spans of your product are known to be normally distributed with a mean of 13 years and a standard deviation...
Information from the American Institute of Insurance indicates the mean amount of life insurance ...
Information from the American Institute of Insurance indicates the mean amount of life insurance per household in the United States is $135,000. This distribution follows the normal distribution with a standard deviation of $42,000. If we select a random sample of 76 households, what is the standard error of the mean? (Round your answer to the nearest whole number.) What is the expected shape of the distribution of the sample mean? What is the likelihood of selecting a sample with...
2) Suppose the weight of a newborn baby follows a normal distribution with a mean of...
2) Suppose the weight of a newborn baby follows a normal distribution with a mean of 3500 grams and a standard deviation of 600 grams. a. What is the probability that the weight of a randomly selected newborn exceeds 4000g? b. For a random sample of 36 newborns, what is the probability that their mean weight is less than 3450g? 3) Suppose that 5% of American adults are vegetarian. Find the probability that in a random sample of 500 American...
The height of the galactic population of humans follows a normal distribution with mean µ =...
The height of the galactic population of humans follows a normal distribution with mean µ = 70 inches and standard deviation σ = 2.5 inches. In order to fit in their armor, stormtroopers must be between 72 inches and 74 inches tall. (a) What percentage of the population is eligible to be stormtroopers? (b) Luke is taller than 75% of the population. Find the difference in his height and the height of the shortest acceptable stormtrooper. Is he actually “a...
Question 5 2 pts An unknown distribution has a mean of 75 and a standard deviation of 18. Samples of size n-30 are drawn randomly from the population. Find the probability that the sample mean is between 80 and 85. (round to 4 decimal places) Example page 397 Wk6Hw_Smp Mean3
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Use Appendix B1 for the z values Compute the probability that the sample mean is: (Round the zvalues to 2 decimal places and the final answers to 4 decimal places.) a. Less than 74 Probability 09 b. Between 74 and 76. Probability c. Between 76 and 77 Probability d. Greater than 77 Probability Not > 3 of 4 < Prey...
A population has a mean μ-85 and a standard deviation σ-21. Find the mean and standard deviation of a sampling distribution of sample means with sample size n 49 H(Simplity your answer) o-# L] (Simplify your answer.) to the random variable x is normally distributed with mean-83 and standard deviation ơ-4 Find the indicated probability P(70sx 76) P(70 < x < 76)= Round to four decimal places as needed.) Enter your answer in the answer box
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