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counting and probability junior
Problem
The table below displays the grade distribution of the students in a mathematics class on the last two tests. For example, exactly one student received a 'D' on Test 1 and a 'C' on Test 2 (see circled entry). What percent of the students received the same grade on both tests? 
(A)
(B)
(C)
(D)
Solution
We need to find the number of those who did get the same on both tests over 30 (the number of students in the class). So, we have Which simplifies to
Final answer
D