What is the sum of the frequencies in a frequency table?

Multiply the number of, for example, pets, to its frequency. After you get the product, add all of those products up.

E.g.:

Number of pets:Frequency

1:8

2:6

3:3

4:2

5:0

6:1

(1*8) + (2*6) + (3*3) + (4*2) + (5*0) + (6*1)

= 8 + 12 + 9 + 8 + 0 + 6 = 43.

The sum is 43.