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# Empirical and zscore

### Review 1 for test 3

68% of the data lies within how many standard deviations about the mean? one standard deviation
What percentage of data is within 2 standard deviations of the mean for a normal distribution 95%
For a normal distribution with mean 100 and standard deviation 15, that value is 2 standard deviations more than the mean? 130
For a normal distribution with mean 85 and standard deviation 15, What is the lower and upper value that captures approximately 68% of the data about the mean? 70 to 100
What is the percentage area between the mean and the z score value of 2.4 for the standard normal distribution? 49.18%
What is the percentage area to the right of the z score value of 2.4 for the standard normal distribution? 0.82%
What is the percentage area to the left of the z score value of 2.4 for the standard normal distribution? 99.18%
What is the z score on a standard normal curve that has 2.5% of the area to its right? z = 1.96
What is the z score on a standard normal curve that has 33% of the area to its left? z = - 0.44
What is the probability that the z score will be less than -1.64? 0.0505 (or 5.05% chance that the z score will be less than -1.64)
Created by: kkamran