A clothing store has offices in Toronto, Montreal, Vancouver and Calgary, and each office has 25 sales representatives. The weekly sales for the sales representatives are normally distributed with a mean of $12,000 and a standard deviation of $ 2,000. Within what range about the mean is the probability 0.9973 that:(adsbygoogle = window.adsbygoogle || []).push({});

1. A given representatives weekly sales will fall

2. The average weekly sales per representative of the Montreal office will fall

3. The average weekly sales per representative of the company will fall.

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I have the answers, but I have no idea from where to even begin. If someone can help me understand and explain this id be very appreciative.

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# Probability question

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