Mark the letter A for item 1 on your Scantron form. In the standard normal distr

Question

Mark the letter A for item 1 on your Scantron form. In the standard normal distribution, a) the mean is 1 and the standard deviation is 0. b) the mean is 0 and the standard deviation is 1. c) the mean is 0.67 and the standard deviation is 1. d) the mean is 0.95 and the standard deviation is 2. The area under the normal curve between z = 0 and z = 1 is _____ the area under the normal curve between z = 1 and z = 2. a) less than b) equal to c) greater than d) dependent on the value of the mean for If the wages of workers for a given company are normally distributed with a mean of $15 per hour, then the proportion of the workers earning more than $13 per hour a) is greater than the proportion of workers earning less than $13 per hour. b) is greater than the proportion of workers earning less than $18 per hour. c) is less than the proportion of workers earning more than the mean wage. d) is less than 50%. For some value of the probability that a standard normal variable is between 0 and X is 0.3770.The value of X is: a) 0.18 b) 0.18 or -0.18 c) 1.16 or -1.16 d) 1.47 For some value of z, the probability that a standard normal variable is below z is 02090. The value of z is: a) -0.81 b)-0.31 c) 0.31 d) 1.96 Given that X is a normally distributed random variable with a mean of 50 and a standard deviation of 2, find the probability that X is between 47 and 54. a) 0.0440 b) 0.1915 c) 0.4552 d) 0.9104

Explanation / Answer

2. Answer is B. mean is 0 and sd is 1

3. Answer is C) are between z of 0 to 1 is more

4. Answer is A) . probability of people above 13 will be more

5. For 0.3770, the z value is calculated for 0.8770 from normal table as 1.16 . So answer is c

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