Calculating Average Score

When Sam was calculating his average score on a test series, he noticed that he had the following scores: 85, 90, 78, and 94. He wants to determine his average score across these four tests.

To find the average score, Sam will use the formula:

$$ ext{Average} = rac{ ext{Sum of all scores}}{ ext{Number of scores}} $$

Based on this information, what is Sam's average score?