Line charts are best suited for continuous data. It will not be possible to represent all values of x separately on the x axis if the data is continuous and hence, a line graph is best suited for continuous data.
Bar charts are best suited for categorical data with frequencies for each category. It is easy to represent the data using bar chart and it will give a clear idea on which category is having high frequency and which have low, just by having a glance at the bar chart.
Pie charts are used to show a population divided into different proportions. When the whole population is divided into subcategories (preferable less number of subcategories), a pie chart can be used for representing the data.
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