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Fix the calculation for the updated belief #1

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Fix the calculation for the updated belief #1

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3 changes: 2 additions & 1 deletion _tutorials/0_Introduction.md
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Expand Up @@ -200,7 +200,8 @@ Now we can build our plot:
# Compute the posterior distribution in closed-form.
N = length(data)
heads = sum(data)
updated_belief = Beta(prior_belief.α + heads, prior_belief.β + N - heads)
tails = N - heads
updated_belief = Beta(prior_belief.α + tails, prior_belief.β + heads)

# Visualize a blue density plot of the approximate posterior distribution using HMC (see Chain 1 in the legend).
p = plot(p_summary, seriestype = :density, xlim = (0,1), legend = :best, w = 2, c = :blue)
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