Consider the following data where class length is given as $\displaystyle 5$. Calculate the number of class intervals $\displaystyle 59, 68, 78, 57, 44, 73, 40, 60, 70, 47$.

On ______ the frequency, starting from a rather low value, gradually reaches the maximum value, somewhere near the central part and then gradually decreases to reach its lowest value at the other extremity.

Divided bar chart is considered for

Data are said to be ______ if the investigator himself is responsible for the collection of the data.

A suitable graph for representing the portioning of total into sub parts in statistics is:

The average of salaries in a factory is $\displaystyle 47,000$. The statement that the average salary $\displaystyle 47,000$ is

Statistics cannot deal with ______ data.