gistfile1.txt

import random
import math

random.seed(1) # to make reproducible results

def rand(): # +/- 10
  return (random.random() - 0.5) * 20

def avg(lst):
  return sum(lst) / len(lst)

def round_rand(val):
    frac, i = math.modf(val)
    if 0.4 < abs(frac) < 0.6:
        i += random.random() - 0.5
    return round(i + frac)

DAYS = 365 * 6 * 10 * 1
ANOMALY = 0.1

def run():
    t = [round_rand(rand() + ANOMALY) for _ in range(DAYS)]
    res = avg(t)
    print(round(res, 1), res)

for _ in range(10):
    run()