If you flip a fair coin 4 times what is the probability it comes up heads every time

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?

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