Answer
13
Work Step by Step
The number of students with at least 30 social interactions for the week is found by starting with the row showing 30 - 34 social interactions, and adding the frequency of that row, the frequency of the 35-39 row, the frequency of the 40-44 row, and the 45-49 row.
This gives us: 4 + 3 + 3 + 3 = 13