Hi need help with this problem with the correct answer please

Given
[tex]mean=1600[/tex]The range for 3 standard deviation to the left and right
1300, 1400, 1500, 1600, 1700,1800,1900
The range for 3 standard deviations to the left and right is
[tex]1300\text{ to 1900}[/tex]The final answer