statistical concepts/ deviation price: $25.00 time left: overdue 1.

Price: $25.00Time left: Overdue

1. Find the standardized variable z if x has Mean 12 and standard deviation 10. (Points : 1) [removed] Z = (x-10)/12 [removed] Z = (x-12)/10 [removed] Z = (12-x)/10 [removed] Z = (x+12)/10

Question 2. 2. Find the area under the standard normal curve to the right of z = 1.55. Round to four decimal places. (Points : 1)

Question 4. 4. Find the area under the standard normal curve over the interval z = −0.44 to z = 0.44. Compute probabilities using the standard normal table in Appendix B (Table 3). Round the answer to four decimal places. (Points : 1)

Question 5. 5. Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 550 and a standard deviation of 100. Find the probability that a student will score over 680. Round your answer to four decimal places. (Points : 1)

Question 6. 6. Scores on a certain nationwide college entrance examination follow a normal distribution with a mean of 600 and a standard deviation of 100. Find the probability that a student will score between 410 and 700. Round your answer to four decimal places. (Points : 1)

Question 8. 8. A population has mean 37 and standard deviation 6. Calculate the standard deviation of x bar for a random sample of size 29. (Points : 1)

Question 9. 9. Suppose the weights of packages of lettuce coming off a packaging line have a normal distribution with mean 8.4 ounces and standard deviation 0.4 ounce. If every package is labeled 9.2 ounces, what proportion of the packages weigh less than the labeled amount? (Points : 1)

Question 10. 10. Suppose the weights of the contents of cans of mixed nuts have a normal distribution with mean 32.4 ounces and standard deviation 0.4 ounce.

If two packages are randomly selected, what is the probability that the average weight is less than 32 ounces?

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