The operator used to check whether an attribute value is within a range of values is

The operator used to check whether the attribute is within a range BETWEEN.

Explanation:

BETWEEN operator is used to check the value of the attribute is within range or not.

WHERE column BETWEEN val1 AND val2;

It can be used in conjunction with WHERE clause to have a greater effect. BETWEEN operator is inclusive so both val1 and val2 are included.