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    So Central Limit Theorem problems all come from http://www.stat.ucla.edu/~nchristo/statistics100A/stat100a_clt.pdf

    The given solution uses z = 2.575 which is quite different from its actual value.

    >>> from scipy.stats import *

    >>> norm.ppf(0.995)

    2.5758293035489004

    Since this value will be multiplied by 10000, this difference is not trivial! I got more than two pages worth of WA before got accepted.