• 確率分布を表すサンプルの活用：

> head(sample)

mu    sigma
39.39 10.18
39.39 21.77
40.90 20.26
45.45 13.20
34.84 12.70
40.90 12.70

pred_iq <- rnorm(10000, mean = sample$mu, sd = sample$sigma)
sum(pred_iq >= 60) / length(pred_iq)

0.0901