how many students were surveyed?

Explanation:

Step1: Identify frequencies for each category

The frequencies for number of siblings 0, 1, 2, 3, 4, 5 are 2, 3, 0, 4, 3, 5 respectively.

Step2: Sum up the frequencies

$2 + 3+0 + 4+3 + 5=17$

Answer:

17