To determine how many jazz classes are given, we first note that the dance school offers 5 different types of classes: jazz, tap, hip-hop, ballet, and lyrical.
Since the school conducts 950 classes in total and conducts the same number of each type of class, we can calculate the number of classes of each type by dividing the total number of classes by the number of different types of classes.
Thus, we perform the following calculation:
\[ \text{Number of classes per type} = \frac{\text{Total classes}}{\text{Number of types}} = \frac{950}{5} = 190 \]
Therefore, the number of jazz classes given is
\[ \boxed{190} \]