Adult IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation of 15. Use the Empirical Rule to find the percentage of adults with scores between 55 and 145.
1) 68%
2) 100%
3) 95%
4) 99.7%

Question

Adult IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation of 15. Use the Empirical Rule to find the percentage of adults with scores between 55 and 145.
	1)	68%
	2)	100%
	3)	95%
	4)	99.7%

anonymous · Answer

What we seek is that portion of the population which is all those who score within three standard deviations of the mean.  That's the vast majority, looks like 99.7%.

anonymous · Answer

It is.