"construct a frequency distribution" just means do the following:
Step1: Put the data into logical groups
Step2: Count the number of data points in each group.
You are told to use 4 groups, with the first one having a lower limit of 60.
Sensible group choices would be:
Group1: Score 60-69
Group2: Score 70-79
Group3: Score 80-89
Group4: Score 90-99
For each group, the frequency is just the number of scores that were in that group.
Code:
Score | Frequency
---------------------
60-69 | 3
70-79 |
80-89 |
90-99 |