The X2 statistic is used to test whether the assumption of normality is reasonable for a given population dist

The X2 statistic is used to test whether the assumption of normality is reasonable for a given population distribution. The sample consists of 5000 observations and is divided into 6 categories (intervals). The degrees of freedom for the chi-square statistic is:

Degrees of freedom in this case is n - 1 = 6 - 1 = 5
n denotes the number of classes