Statistics (NCERT Ex 14.1 and 14.2)
NCERT Exercise 14.1
Question:1
Give five examples of data that you can collect from day to day life.
Answer:
In our day to day life,we can collect the following data.
1. Numbers of girl students per class in a school.
2. Number of cars of different models in our colony.
3. Production of rice in last 20 years in our country.
4. Rainfall in our city in the last 10 years.
5. Scores made by a team in Indian Premier League tournament.
Question:2
Classify the data in Q1 above as primary or secondary data.
Answer:
The information which is collected by the investigator himself with defined objectives is called as primary data whereas when the information is
gathered from a source which already had stored, is called as
secondary data.
Item 1 and 2 are the primary data where as the data in 3, 4 and 5 is secondary data.
Exercise 14.2
Question:1
The blood groups of 30 students of class VIII are recorded as follows:
A,B,O,O,AB,O,A,O,B,A,O,B,A,O,O
A,AB,O,A,A,O,O,AB,B,A,O,B,A,B,O.