A 71% or a C-
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Out of 100? (31/45 * 100) = 68.9 (rounded to 3 significant figures).The letter grade depends on your teacher's marking system.
25 out of 45 = 56% = Failing grade
The median is 45.
23/(32/45) = 32.34375
the only common factors of 45 and 32 is 1