Which test to determine if statistically significant

What test can I use to determine if a result is statistically significant, see screenshot: https://www.screencast.com/t/y5z9SpFtW. 5% of the orders generate 8% of the revenue for a specific channel, but the order count is small (under 30). I'd like to determine if the channel performance is statistically significant and we should focus more on it. Thanks in advance for helping this newbie (not a statistician, just would like to increase rigor of analysis).