Can you please check my answers

I. Multiple-choice questions. (1) Which of the following is not a property of a normal distribution? (A) The total area under the curve is 1.0 (B) The curve is symmetric about the mean. C) The two tails of the curve extend indenitely. The value of the mean is always greater than the standard deviation. (2) The 2 value of the mean ,u, for a normal distribution curve is always (A) positive (B) negative a zero (D) Cannot be determined (3) T quartiles Q1, Q2, and 62;; for the standard normal 2 - curve are 0.675, 0, 0.675 (B) 1, 0, 1 (C) 0.25, 0.50, 0.75 (D) Cannot be determined Questions No. 4 and 10 are refer to the following information: The Wechsler Adult Intelligence Scale is an IQ score obtained through a test and the IQ score 3: is normally dis- tributed with a mean of 100 and a standard deviation of 15. A bell-shaped graph can be drawn to represent this distribution. (4) What is the value of the median for the IQ score 3? (A) 0 g 100 (C) 15 (D) Cannot be determined (5) What is the value of the mode for the IQ score 3? (A) 0 100 (C) 15 (D) Cannot be determined (6) What is the value of the variance for the IQ score 3? (A) 02 = 0 (B) 1002 = 10000 ((3)152 = 225 (D) Cannot be determined (7) A random sample of 64 IQ scores is randomly chosen from the population. Then the probability that the sample mean I\": is at least 100 is: (A) 0.64 0.50 (C) 0 (D) Unknown (8) If one of your friend had the IQ score of x = 125, is it unusually high? a No. It is a usual score within two standard deviations above the average. (B) No. It is only half of the mean above. (C) Yes. It is 25 more than the average. (D) Yes. It is more than two standard deviations above the average for the sampling distri- bution of the sample mean 5: (9) A sample of size 25 is drawn from the population. What are the mean and standard deviation of the sampling distribution of the sample means? (A) ,ui = 20 and 0'5 = 0.6 (B) ,ui = 20 and 0'; = 3 (C) ,ui = 100 and 05 =15 Q) .05 = 100 and 05 = 3 (10) If 25 of your friends had the mean IQ score of 5: = 125, is it unusually high? (A) No. It is a usual score within two standard deviations above the average. (B) No. It is only half of the mean above. (C) Yes. It is 25 more than the average. E) Yes. It is more than two standard deviations above the average for the sampling distri- bution of 5