Gráfico de barras agregadas:
<iframe width="100%" height="523" frameborder="0" src="https://observablehq.com/embed/@danielreboucas/vega-lite-api-exercicios-2022?cells=aggregatedBarChar"></iframe>Scatterplot:
<iframe width="100%" height="425" frameborder="0" src="https://observablehq.com/embed/@danielreboucas/vega-lite-api-exercicios-2022?cells=scatterplot"></iframe>