import random
import math

def shum(mu, var, n, filename):
    sigma = math.sqrt(var)
    data = []
    f = open(filename, "w", encoding="utf-8")
    for i in range(n):
        x = random.gauss(mu, sigma)
        data.append(x)
        if (i + 1) % 3 == 0:
            f.write(f"{data[i-2]} {data[i-1]} {data[i]}\n")
        elif i == n - 1:
            start = i - (i % 3)
            f.write(" ".join(str(v) for v in data[start:]) + "\n")
    f.close()
    return data