Question: A store accepts 2025 purchases. Each purchase is considered mutually independent and has an identical distribution with a mean of 3125 and a standard deviation

A store accepts 2025 purchases. Each purchase is considered mutually independent and has an identical distribution with a mean of 3125 and a standard deviation of 250. Determine the 90th percentile for the distribution of total purchases at the store.

The answer is 6343000. please explain why

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