estudiantes <- 1:20
calificaciones <- c(78, 85, 90, 72, 88, 95, 80, 76, 85, 92,
70, 84, 89, 77, 85, 91, 73, 82, 87, 79)
barplot(calificaciones,
names.arg = estudiantes,
main = "Calificaciones de los estudiantes",
xlab = "Estudiantes",
ylab = "Calificación",
ylim = c(0, 100))
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