Question
Suppose a normal model has a mean of ?=100, and95% of the values are between 90 and 110. Which of the following must be true about the standarddeviation?
A.The standard deviation must be much less than 5. B.The standard deviation must be approximately equal to 5.C.The standard deviation must be much greater than 5. D.There is not enough information to determine anything about the standard deviation.
