how many students were surveyed? answer attempt 1 out of 2 students

how many students were surveyed? answer attempt 1 out of 2 students
Answer
Explanation:
Step1: Identify frequencies
The frequencies for each interval are 2, 4, 2, 7, 5, 1.
Step2: Sum the frequencies
$2 + 4+2 + 7+5 + 1$ $= 21$
Answer:
21