Final answer:
The mean change in elevation per minute for the snowboarder is 414 feet.
Step-by-step explanation:
To find the mean change in elevation per minute, we need to divide the total change in elevation by the time taken. In this case, the snowboarder descends from an elevation of 2253 feet to 1011 feet in 3 minutes. Therefore, the total change in elevation is 2253 - 1011 = 1242 feet. Dividing this by the time taken, we get 1242 / 3 = 414 feet per minute.
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