The numbers less than 4 are 1, 2, and 3. From the table, a 1 was rolled 6 times, a 2 was rolled 4 times, and a 3 was rolled 8 times. Therefore, a number less than 4 was rolled \(6+4+8=18\) times

It is given that the number cube was rolled 50 times.

The relative frequency of rolling a number less than 4 is:

\((\text{аrequency of rolling a number less than 4 total number of rolls}) \times 100%\)

Since a number less than 4 was rolled 18 times and the total number of rolls is 50, then the relative frequency of rolling a number less than 4 is:

\(\displaystyle{\frac{{{18}}}{{{50}}}}\times{100}\%={18}\times{\frac{{{100}}}{{{50}}}}\%={18}\times{2}\%={36}\%\)