Solve. -A Mathematical Model for the Average of a Group of Group

Solve.
-A mathematical model for the average of a group of people learning to type is given by where N(t) is the number of words per minute typed after t hours of instruction and practice (2 hours per day, 5
days per week) . What is the rate of learning after 50 hours of instruction and practice?

A) 0.5 words per minute typed per hour of instruction and practice
B) 0.12 words per minute typed per hour of instruction and practice
C) 0.1 words per minute typed per hour of instruction and practice
D) 0.15 words per minute typed per hour of instruction and practice

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