A Standardized Test Has a Mean Score of 500 Points $\text { Adam: } 575 \quad \text { Beth: } 690 \quad \text { Carlos: } 750 \quad \text { Doug: } 280 \quad \text { Ella: } 440$

A standardized test has a mean score of 500 points with a standard deviation of 100 points. Five students' scores are shown below.

$\text { Adam: } 575 \quad \text { Beth: } 690 \quad \text { Carlos: } 750 \quad \text { Doug: } 280 \quad \text { Ella: } 440$


Which of the students have scores within two standard deviations of the mean?

A) Adam, Beth
B) Adam, Beth, Ella
C) Adam, Beth, Carlos, Ella
D) Carlos, Doug