Across
1
U-shaped curve of a quadratic function
3
Single numeral from 0 to 9
6
Closed shape with straight sides
7
Sum divided by count
11
The number representing nothing
Down
2
Visual representation of data
4
Three-sided polygon
5
Round shape with all points equidistant
8
Number less than zero
9
Middle value in an ordered dataset
10
Steepness of a line