The observation which is repeated most often in an ungrouped data is called .......... of the data.

In the figure,there is a histogram depicting the daily wages of workers in a factory. Construct the frequency distribution table.

For drawing a frequency polygon of a continuous frequency distribution,we plot the points whose ordinates are the frequencies of the respective classes and abscissae are respectively:

State whether each of the following statements is true or false:
$(1)$ The median of the observations $12, 13, 14, 15, 16$ is $14$.
$(2)$ The mode of the observations $1, 3, 5, 7, 9$ is $5$.

Find the median of the observations $18, 8, 12, 3, 20, 4, 10, 5$.

Give five examples of secondary data that you can collect from your day-to-day life.