The following data relate to the marks of group of students:Marks | No of students--- | ---Below $\displaystyle 10$ | $\displaystyle 15$Below $\displaystyle 20$ | $\displaystyle 38$Below $\displaystyle 30$ | $\displaystyle 65$Below $\displaystyle 40$ | $\displaystyle 84$Below $\displaystyle 50$ | $\displaystyle 100$How many students got marks more than $\displaystyle 30$?

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.