Check my answer ?? Medal and fan(:

A normal distribution has a mean of 312.00 and a standard deviation of 26.45. Which interval centered at the mean has a 68% probability of containing a random value drawn from the distribution?
A) [259.45, 364.55]
B) [270.45, 353.55]
C) [275.55, 348.45]
D) [285.55, 338.45]

Question

Check my answer ?? Medal and fan(:

A normal distribution has a mean of 312.00 and a standard deviation of 26.45. Which interval centered at the mean has a 68% probability of containing a random value drawn from the distribution?
A)	[259.45, 364.55]	
B)	[270.45, 353.55]	
C)	[275.55, 348.45]	
D)	[285.55, 338.45]  <I chose this one

phi · Answer

yes, $ \pm$ std dev around the mean represents about 2/3 of the area under the bell curve.