Final answer:
Without the specific frequency polygon chart, it is impossible to answer how many people went to the cinema less than 3 times. Normally, one would sum the frequencies for visits of 0, 1, and 2 times to get this number.
Step-by-step explanation:
To determine how many people went to the cinema less than 3 times based on a frequency polygon, we would normally need to refer to the specific chart provided with the data. Unfortunately, the data needed to answer this question is not included in the provided context.
However, to answer such a question, you would need to look at the frequency polygon and count the number of people who went to the cinema either 0, 1, or 2 times, as these are the numbers that are less than 3. The sum of these frequencies would give you the total number of people who visited the cinema less than 3 times. Since the specific frequencies are not provided here, we cannot accurately determine the answer from the given choices of 20, 30, 40, or 50 people.