Statistics Test...

In the given ungrouped data $$5, 4, 3, 1, 5, 3, 2, 5, 5, 1, 5, 5,$$ the frequency of $$5$$ is equal to :

The frequency of the class interval $$ 3 -5$$ in the following distribution is :
$$5, 5, 6, 4, 9, 5, 3, 2, 7, 6, 3, 8, 4$$

Range of the data $$6, 1, 2, 3, 9, 8, 3, 4, 8, 2, 3$$ is :

The range is defined as :

Rudra is looking for a hotel for a vacation. He can do this in two ways.
1. Call prospective hotels and ask for their tariffs.
2. Check a booking website and check the tariffs of many hotels together.

Ramya wanted to group the students in her class on the basis of height. She checked the semi-annual class records to collect this data.
What kind of data did she collect?

Ramya wanted to group the students in her class on the basis of height. For this, she asked every student their height in inches.
What kind of data did she collect?

When the information was collected by the investigator herself or himself with a definite objective in her or his mind, the data obtained is called

You are asked to do a door-to-door survey in your neighborhood regarding what precautions they have taken to protect themselves from COVID-19.
What kind of data will you collect?

On a website, each visitor has to fill a survey regarding the advertisements they usually come across on the website. 
This type of data is