The table summarizes the number of mobile phones per 100 people in the population of each of the 64 countries with the largest number of phones.

(a) Use class marks and the number of countries (frequency) to find the mean number of mobile phones per 100 people in the population for these countries.

(b) Should we expect this mean to increase or decrease in the future?

Transcribed Image Text:

Number of Mobile Phones Number of per 100 People Population Countries 0-19 2 20-39 1 40-59 60-79 10 80-99 7 100–119 20 120-139 14 140-159 6. 160-179 2 180-199 1 200-219 1