A Data Set Has a Mean of 70 and a Standard

Multiple Choice

A data set has a mean of 70 and a standard deviation of 10. Which of the following might possibly be true?

A) At least 15% of the data values are less than 40 or greater than 100.
B) More than 90% of the data values are between 40 and 100.
C) No more than 50% of the data values are between 50 and 90.
D) No less than 30% of the data values are less than 50 or greater than 90.