The Grades on a Chemistry Exam for a Sample of 40

The grades on a chemistry exam for a sample of 40 students are as follows: $$\begin{array} { l l l l l l l l l l } 47 & 82 & 83 & 54 & 79 & 62 & 68 & 58 & 41 & 48 \\84 & 68 & 71 & 91 & 71 & 86 & 69 & 75 & 94 & 55 \\62 & 64 & 67 & 76 & 79 & 61 & 81 & 77 & 59 & 38 \\57 & 74 & 42 & 56 & 51 & 54 & 36 & 65 & 68 & 63\end{array}$$ Estimate the percentage of grades that are between 80 and 90.

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