The weights of healthy adult male Labrador Retrievers are approximately Normally distributed with a mean of 77 pounds and a standard deviation of 6 pounds. Draw an appropriate diagram with shading and use a z-score approach to find the weight which would mark the first quartile of this distribution. (Hint: the first quartile is also known as the location of the 25th percentile.) Then, create a PDF of that work and upload it where indicated.

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