Select the correct answer from each drop-down menu.
A bell-shaped curve is plotted in first quadrant of a coordinate plane on X-axis. The curve ranges between minus 1.8 to 11.4. The peak of the curve is centered at 4.8.
The data represented by the graph is normally distributed and adheres to the 68-95-99.7 rule. The standard deviation of this data is
, and
% of the population will fall below the mark of 7.