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 get_sample_size(z=1.96, conf=0.95, sigsqr=1, delta=0.5):
    return (z*z*sigsqr)/(delta*delta)

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