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4- Harry Potter and The Sorcerer's Stone is less popular with 60,000 people who want to watch the movie on Amazon at evenings at 8pm

Harry Potter and The Sorcerer's Stone is less popular with 60,000 people who want to watch the movie on Amazon at evenings at 8pm EST. What is the standard deviation if the probability that more than 80,000 people want to watch the movie is 0.15?

(round to the nearest whole number)

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