Определите размер необходимой выборки для исследования среднего чека за кофе в городе N, если известны следующие параметры: погрешность (delta); дисперсия (sigsqr); уровень доверия (conf). Ответ округлите до целого.

def func(delta, sigsqr, conf):
    return round(sigsqr * conf ** 2 / delta ** 2)

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