Test Scores
the Scores on a Calculus Test for a Random

Essay

Test scores
The scores on a calculus test for a random sample of 40 students are as follows:
$$\begin{array} { l l l l l l l l l l } 63 & 74 & 42 & 65 & 51 & 54 & 36 & 56 & 68 & 57 \\62 & 64 & 76 & 67 & 79 & 61 & 81 & 77 & 59 & 38 \\84 & 68 & 71 & 94 & 71 & 86 & 69 & 75 & 91 & 55 \\48 & 82 & 83 & 54 & 79 & 62 & 68 & 58 & 41 & 47\end{array}$$
-A supermarket's monthly sales (in thousands of dollars)for the last year were as follows:
$\begin{array}{|l|cccccccccccc|}\hline \text { Month } & 1 & 2 & 3 & 4 & 5 & 6 & 7 & 8 & 9 & 10 & 11 & 12 \\\hline \text { Sales } & 78 & 74 & 83 & 87 & 85 & 93 & 100 & 105 & 103 & 89 & 78 & 94 \\\hline\end{array}$ Construct a relative frequency bar chart for this data set.How many observations are there in this data set?