Find an equation of the tangent plane to the given surface at the specified point. 
Definitions:
Mean
The average of a set of numbers, calculated by adding them together and dividing by the number of values.
Standard Deviation
A measure of the amount of variation or dispersion of a set of values from the mean.
ACT Type Score
A numerical measurement that represents a student's achievement on the ACT test, which is commonly used for college admissions in the United States.
Normal Curve
A bell-shaped curve that represents the distribution of many types of data where most occurrences take place around the average, and fewer instances occur as you move away from the center.
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