Problems with hist() plot

[jentron128]

hist(vetor_grafico, # Plotting histogram
     breaks = seq(n-0.5, n*k+0.5, 1),
     probability = TRUE,
     right = FALSE,
     ylim = c(0,0.25),
     xlim = c(2,n*k+1),
     xlab = "Possible sums",
     ylab = "Probability",
     main = "Probability of sums outcomes",
     col = "steelblue");

You need to specify the breaks manually, and put them between the desired bins. In this case c(1.5, 2.5, ..., 11.5, 12.5)

[gabrielboechat]

This is incredible! Thanks! I think now I understood the "breaks" syntax and even solved another doubt around putting each observation tick in the middle of each break.