The phrase 'highest average score' is correct and can be used in written English.
For example, you could use it in the sentence "Out of all the teams, the Tigers had the highest average score".
The candidate with the highest average score wins.
Massachusetts had the highest average score on the fourth-grade test, followed by Maine, Montana, North Dakota and Iowa.
On the eighth-grade test, Montana produced the highest average score, followed by Massachusetts, Ohio, North Dakota and Vermont.
And golfers carrying a golf bag posted the highest average score.
Gothenburg had the highest average score in three of the 10 categories, but different cities showed their character, too.
Of all those taking part in the 2014 series, Pixie Lott has the highest average score at 34.2 (based on scores up to 22 November 2014).
The highest average scores were netted by students with computer access and without a bedroom TV; students with a personal television and without computer access at home scored the lowest, on average.
Our analysis also showed that functions whose employees had the highest average scores performed about 24% better than other functions across a wide range of metrics, including effectiveness, productivity, employee engagement, and market-share growth.
Amongst the injured subjects, during the entire study period, the highest average scores of disability were attributed by the respondents to feeling of discomfort/pain.
The highest average scores (>2.5 or more than 50% implementation) were obtained for comp4, label1, label2, prov3, gover3, monit3, monit4, platf2 and fund1 (table 1).
The rather high average score in educational climate and MSF scorings might indicate a positive selection bias.
