You have conducted a survey on a number of households and found out how many pets they owned

Using tally marks

Step-by-step explanation:

Missing information;

Number of pets are;

3,0,1,4,4,1,2,0,2,2,0,2,0,1,3,1,2,1,1,3

Find;

Ungroups frequency distribution table

Computation:

Number of pets    Tally     Frequency

0                                           4

1                               I           6

2                                            5

3                              III               3

4                              II                 2