Test Scores
the Scores on a Calculus Test for a Random

question 68

Essay

Test scores
The scores on a calculus test for a random sample of 40 students are as follows:
$$\begin{array} { l l l l l l l l l l } 63 & 74 & 42 & 65 & 51 & 54 & 36 & 56 & 68 & 57 \\62 & 64 & 76 & 67 & 79 & 61 & 81 & 77 & 59 & 38 \\84 & 68 & 71 & 94 & 71 & 86 & 69 & 75 & 91 & 55 \\48 & 82 & 83 & 54 & 79 & 62 & 68 & 58 & 41 & 47\end{array}$$
-Fifty two truck buyers were asked to indicate the car dealer they believed offered the best overall service.The four choices were A,B,C,and D as shown below:
$\begin{array}{llllllllllll}\mathrm{A} & \mathrm{C} & \mathrm{C} & \mathrm{C} & \mathrm{D} & \mathrm{C} & \mathrm{B} & \mathrm{A} & \mathrm{C} & \mathrm{D} & \mathrm{A} & \mathrm{B} & \mathrm{C} \\\mathrm{D} & \mathrm{B} & \mathrm{C} & \mathrm{B} & \mathrm{A} & \mathrm{C} & \mathrm{B} & \mathrm{B} & \mathrm{C} & \mathrm{B} & \mathrm{B} & \mathrm{A}& \mathrm{C} \\\mathrm{A} & \mathrm{C} & \mathrm{C} & \mathrm{A} & \mathrm{D} & \mathrm{B} & \mathrm{B} & \mathrm{C} & \mathrm{C} & \mathrm{A} & \mathrm{C} & \mathrm{D}& \mathrm{B} \\\mathrm{A} & \mathrm{D} & \mathrm{C} & \mathrm{D} & \mathrm{A} & \mathrm{B} & \mathrm{B} & \mathrm{C} & \mathrm{D} & \mathrm{A} & \mathrm{B} & \mathrm{D}& \mathrm{A} \end{array}$ Construct a table showing the frequencies and relative frequencies for this data set.What proportion of car buyers rated dealer D as the best?