State whether each of the following statements is true or false:
$(1)$ The mean of the first four odd natural numbers is $4$.
$(2)$ The highest value of the data is called a range.
$(3)$ The mean of $30$ observations is $30$,then the sum of those observations is $60$.

(N/A) $(1)$ True: The first four odd natural numbers are $1, 3, 5, 7$. Their mean is $\frac{1+3+5+7}{4} = \frac{16}{4} = 4$. Thus,the statement is true.
$(2)$ False: The range of a data set is defined as the difference between the highest and lowest values (Range = Maximum value - Minimum value). The highest value itself is not the range.
$(3)$ False: Mean = $\frac{\text{Sum of observations}}{\text{Number of observations}}$. Given Mean = $30$ and Number of observations = $30$,the Sum = $30 \times 30 = 900$. Since $900 \neq 60$,the statement is false.