NCERT solutions for Computer Science [English] Class 12 chapter 7 - Understanding Data [Latest edition]

Identify data required to be maintained to perform the following service:

Declare exam results and print e-certificates.

Identify data required to be maintained to perform the following service:

Register participants in an exhibition and issue biometric ID cards.

Identify data required to be maintained to perform the following service:

To search for an image by a search engine.

Identify data required to be maintained to perform the following service:

To book an OPD appointment with a hospital in a specific department.

A school that has 500 students wants to identify beneficiaries of the merit-cum-means scholarship, achieving more than 75% for two consecutive years and having a family income of less than 5 lakh per annum. Briefly describe data processing steps to be taken to beneficial prepare the list of schools.

A bank ‘xyz’ wants to know about its popularity among the residents of a city ‘ABC’ on the basis of the number of bank accounts each family has and the average monthly account balance of each person. Briefly describe the steps to be taken for collecting data and what results can be checked through the processing of the collected data.

Identify the type of data being collected/generated in the following scenario:

Recording a video.

Identify the type of data being collected/generated in the following scenario:

Marking attendance by the teacher.

Identify the type of data being collected/generated in the following scenario:

Writing tweets

Identify the type of data being collected/generated in the following scenario:

Filling out an application form online.

Consider the temperature (in Celsius) of 7 days of a week as 34, 34, 27, 28, 27, 34, 34. Identify the appropriate statistical technique to be used to calculate the following:

Find the average temperature.

Consider the temperature (in Celsius) of 7 days of a week as 34, 34, 27, 28, 27, 34, 34. Identify the appropriate statistical technique to be used to calculate the following:

Find the temperature Range of that week.

Consider the temperature (in Celsius) of 7 days of a week as 34, 34, 27, 28, 27, 34, 34. Identify the appropriate statistical technique to be used to calculate the following:

Find the standard deviation temperature.

A school teacher wants to analyse the results. Identify the appropriate statistical technique to be used along with its justification for the following case:

The teacher wants to compare performance in terms of division secured by students in Class XII A and Class XII B where each class's strength is the same.

A school teacher wants to analyse the results. Identify the appropriate statistical technique to be used along with its justification for the following case:

The teacher has conducted five unit tests for that class in the months of July to November and wants to compare the class performance in these five months.

Suppose the annual day of your school is to be celebrated. The school has decided to felicitate the parents of the students studying in classes XI and XII, who are alumni of the same school. In this context, answer the following question:

Which statistical technique should be used to find out the number of students whose parents are alumni of this school?

Suppose the annual day of your school is to be celebrated. The school has decided to felicitate the parents of the students studying in classes XI and XII, who are alumni of the same school. In this context, answer the following question:

How varied are the age of the parents of the students of that school?

For the annual day celebrations, the teacher is looking for an anchor in a class of 42 students. The teacher would make a selection of an anchor on the basis of singing skills, writing skills, as well as monitoring skills.

Which mode of data collection should be used?

For the annual day celebrations, the teacher is looking for an anchor in a class of 42 students. The teacher would make the selection of an anchor on the basis of singing skills, writing skills, as well as monitoring skills.

How would you represent the skill of students as data?

Differentiate between structured and unstructured data giving one example.

The principal of a school wants to do the following analysis on the basis of food items procured and sold in the canteen:

1. Compare the purchase and sale prices of fruit juice and biscuits.
2. Compare sales of fruit juice, biscuits, and samosa.
3. Variation in the sale price of fruit juices of different companies for the same quantity (in ml).

Create an appropriate dataset for these items (fruit juice, biscuits, samosa) by listing their purchase price and sale price. Apply basic statistical techniques to make the comparisons.