A card-dealing machine deals spades (1) ,hearts (2) ,clubs (3) ,and diamonds (4) at random as if from an infinite deck.In a randomness check,1,600 cards were dealt and counted.The results are shown below. 
For the goodness-of-fit test,the degrees of freedom are ____.
Definitions:
Formal
Refers to something done in accordance with rules of convention or etiquette; suitable for or constituting an official or important situation or occasion.
Explicit
Clearly expressed or fully stated in the actual text.
Practical Intelligence
A facet of intelligence that involves the ability to solve everyday problems by utilizing knowledge gained from experience in order to effectively deal with the tasks and challenges encountered in daily life.
Analytical Intelligence
One of the three types of intelligence in Robert Sternberg's Triarchic Theory of Intelligence, focusing on problem-solving abilities.
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