The mean of a set of normally distributed data is 600 with a standard deviation of 20. What percent of the data is between 580 and 620?

Question 8 options:

34%

95%

68%

50%

Question

The mean of a set of normally distributed data is 600 with a standard deviation of 20.  What percent of the data is between 580 and 620?

Question 8 options:
	
34%

	
95%

	
68%

	
50%

anonymous · Answer

use the empirical rule.  how many standard deviations from the mean are 580 and 620 (each one individually)?

e.mccormick · Answer

If you do not have a good reference to what percentage is for what SD, take a look at the forst illustration here: http://www.education.com/reference/article/norm-referenced-testing/ They show a normal curve there and you just need to find out what part of the curve 580 to 620 would represent, then add up any percentgae values in that area.