Statement:
In Sri Lanka, mobile Internet is on average less expensive than in Tonga

In the Most expensive mobile internet rating Sri Lanka holds position #151 2022 out of 204 and Tonga is #105 out of 204 2022.
Position of Sri Lanka is better than position of Tonga.
Both countries holds average positions in the "Most expensive mobile internet" rating. So Average price of 1GB (USD) is an average for both Sri Lanka and Tonga, compared to most countries of the World.

Referencies:

  1. Most expensive mobile internet 2022 by cable.co.uk
    The countries in the rating sorted by 'Average price of 1GB (USD)' in descending order.
    Sri Lanka 'Average price of 1GB (USD)' value is 0.27
    Tonga 'Average price of 1GB (USD)' value is 1.19