The degrees of freedom for a chi-squarded test is k-1, where k equals the number of categories for the test.
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One less than the possible outcomes.
Cover the options and figure out which fits best.
A library, or any bookshop
If you got 20 problems wrong on a 75 question test your grade would be 73% or a C. You can find that by subtracting the amount of questions you got wrong from the amount you got right, 55 in this case. Divide the amount of correct questions by the amount of questions on the test to get .733333. That is the grade.
most odd answers are in the back but some like the standardized test practice are not