Given:
A random number generator generates numbers from 1 to 10.
So, the all possible outcomes = 10
The number of outcomes when the number generator generates a number less than 3 = 2 ( which are the numbers 1 and 2)
So, the probability = 2/10 = 0.2
The probability as a percentage = 0.2 * 100% = 20%
So, the answer will be 20%