Question

watson gave her students a biology test last week. here are the test scores for each of the sixteen students.

(a) complete the grouped frequency distribution for the data. (note that the class width is 4.)

(b) using the classes from part (a), draw the frequency polygon for the data. note that you can add or remove classes from the figure. label each class with its midpoint.

Explanation:

Step1: Count data in 71.5 - 75.5

The scores in this range are 73,73,73. So frequency is 3.

Step2: Count data in 75.5 - 79.5

The scores in this range are 77,78,79. So frequency is 3.

Step3: Count data in 79.5 - 83.5

The scores in this range are 81,81,81,82. So frequency is 4.

Step4: Count data in 83.5 - 87.5

The scores in this range are 84,85,86,87. So frequency is 4.

Step5: Count data in 87.5 - 91.5

The scores in this range are 89,89,90,91. So frequency is 4.

Answer:

Test scores	Frequency
75.5 to 79.5	3
79.5 to 83.5	4
83.5 to 87.5	4
87.5 to 91.5	4