Classify the data you can collect from your day-to-day life as primary or secondary data.
In our day-to-day life,we can collect the following data:
$1.$ Number of females per $1000$ males in various states of our country.
$2.$ Weights of students of our class.
$3.$ Production of wheat in the last $10$ years in our country.
$4.$ Number of plants in our locality.
$5.$ Rainfall in our city in the last $10$ years.

(N/A) The information which is collected by the investigator himself with a definite objective in his mind is called primary data. Conversely,when the information is gathered from a source that already has the information stored,it is called secondary data.
$1.$ Number of females per $1000$ males: Secondary data (collected from government records).
$2.$ Weights of students of our class: Primary data (collected by direct measurement).
$3.$ Production of wheat in the last $10$ years: Secondary data (collected from agricultural reports).
$4.$ Number of plants in our locality: Primary data (collected by direct observation).
$5.$ Rainfall in our city in the last $10$ years: Secondary data (collected from meteorological records).
Thus,$1, 3,$ and $5$ are secondary data,while $2$ and $4$ are primary data.