Question

hernandez gave his students a biology test last week. here are the test scores for each of the eighteen students. test scores 76 69 84 73 88 84 75 80 68 88 85 70 77 72 86 80 87 69 (a) complete the grouped frequency distribution for the data. (note that the class width is 6.) test scores frequency 66 to 71 72 to 77 78 to 83 (b) construct a histogram for

Explanation:

Step1: Count scores in 66 - 71

Count the number of scores in the range 66 to 71 from the data set {76, 69, 84, 73, 88, 84, 75, 80, 68, 88, 85, 70, 77, 72, 86, 80, 87, 69}. The scores in this range are 69, 68, 70, 69. So the frequency is 4.

Step2: Count scores in 72 - 77

Count the number of scores in the range 72 to 77. The scores are 73, 75, 77, 72. So the frequency is 4.

Step3: Count scores in 78 - 83

Count the number of scores in the range 78 to 83. The scores are 80, 80. So the frequency is 2.

Answer:

Test scores	Frequency
72 to 77	4
78 to 83	2