Class | 0-10 | 10-20 | 20-30 | 30-40 | 40-50Freq. | 4 | 6 | 20 | 8 | 3For the class 20-30. Cumulative frequency is:

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

$Statistics cannot deal with ______ data.$

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