A student conducted a survey among his friends and relatives to determine the relationship between the age of a person and the number of marketing phone calls he or she received within one month. The information is given in the table below.
2.1 Complete the frequency and cumulative frequency columns in the table given in the ANSWER BOOK.
2.2 How many people participated in this survey?
2.3 Write down the modal class.
2.4 Draw and ogive (cumulative frequency) to represent the data on the grid given in the ANSWER BOOK.
2.5 Determine the percentage of the marketing calls received by people older than 54 years.