Question

1. test scores, out of 100 points

92 84 95 77 74 80 95 70 66
73 68 90 78 64 72 78 76 65
59 71 77 92 91 89 74 76 90
frequency table
interval # of values

Explanation:

Step1: Determine interval ranges

Let's use intervals of 10: 50 - 59, 60 - 69, 70 - 79, 80 - 89, 90 - 99.

Step2: Count values in each interval

For 50 - 59: There is 1 value (59).
For 60 - 69: Values are 60, 64, 65, 66 so there are 4 values.
For 70 - 79: Values are 70, 71, 72, 73, 74, 74, 76, 76, 77, 77, 78, 78 so there are 12 values.
For 80 - 89: Values are 80, 84, 89 so there are 3 values.
For 90 - 99: Values are 90, 90, 91, 92, 92, 95, 95 so there are 7 values.

Answer:

Interval	# of values
60 - 69	4
70 - 79	12
80 - 89	3
90 - 99	7