Find the number of observations between $250$ and $300$ from the following dataValue | More than $200$ | More than $250$ | More than $300$ | More than $350$No of observation | $56$ | $38$ | $15$ | $0$

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

$Statistics cannot deal with ______ data.$

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