# Statistical concepts/ Deviation

Feb 3rd, 2012
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1. Find the standardized variable z if x has Mean 12 and standard deviation 10. (Points : 1) Question 2. 2. Find the area under the standard normal curve to the right of z = 1.55. Round to four decimal places. Question 3. 3. Find the area under the standard normal curve to the left of z = 2.33 (Points : 1) Qestion 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 5 more question. answer with explanation!!!!!!!!!!!!!!!!!

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Statistical concepts/ DeviationPrice: \$25.00 Time left: Overdue 1. Find the standardized variable z if x has Mean 12 and standard deviation 10. (Points : 1) Z = (x-10)/12 Z = (x-12)/10 Z = (12-x)/10 Z = (x+12)/10Question 2. 2. Find the area under the standard normal curve to the right of z = 1.55. Round to four decimal places. (Points : 1) .9394 .9505 .0606 .0485 Question 3. 3. Find the area under the standard normal curve to the left of z = 2.33 (Points : 1) .0099 .0102 .9901 .4901 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) 0.3300 0.3400 0.3500 0.3600 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) 0.1587 0.0968 0.1459 0.9032 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) 0.9635 0.7826 0.8347 0.8126 Question 7. 7. A population has mean 70 and standard deviation 15. Calculate

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