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Critical Reasoning: Argument Flaw Questions

The average giraffe is six and a half to seven foot tall at the age of six months. Therefore, if a six-month-old giraffe is over seven feet tall, it grew by more inches each month than the average giraffe does.  

Which of the following indicates a flaw in the reasoning above? 



Weight is outside the scope of this argument. It is not mentioned in the argument at all.



The fact a giraffe is overall taller than average does not mean it consistently grew more than average in each month. For example, a tall giraffe could also be behind the average 5 out of 6 months, and then sprint beyond the six-month average in the last month.

In other words, this argument confuses a speedier growth on average or in total with a speedier growth each and every month.



The detail in this answer choice is insignificant as the argument deals with the average height of six-month-old giraffes. Some may be taller than average and some shorter, but that does not constitute a flaw.

Try to find a gap between the parameter mentioned in the premise and the parameter mentioned in the conclusion



The conclusion makes no suggestions about normal or abnormal development - like the premise, it's about height. Therefore, this answer choice does not highlight any flaw in the argument.

Try to find a flaw in the reasoning that is concerned with height.



While the statement in this answer choice is true, the conclusion does not equate between general giraffe averages and the average growth rate of a specific giraffe. Therefore, this statement does not highlight a flaw in the argument.

Examine the conclusion again. It revolves entirely around the specific case of a tall six-month-old giraffe, using the general averages for giraffes as standards for measurement.

The giraffe's weight is not taken into consideration.  
Overall faster growth and faster growth per month are not the same.
Some six-month-old giraffes are almost eight feet tall.
Height is only one measure of normal development in giraffes.
The average height at six months for giraffes in general is not the same as the average growth rate of a single giraffe.