The following data relate to the marks of a group of students:Marks | $<10$ | $<20$ | $<30$ | $<40$ | $<50$---|---|---|---|---Freq | $15$ | $38$ | $65$ | $84$ | $100$How many students got marks more than $30$?

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 $47,000$. The statement that the average salary $47,000$ is

$Statistics cannot deal with ______ data.$

$Census reports are used as a source of ______ data.$