=473÷5

=94.6 minutes,

( 100+97+96+95+97)÷5

=485÷5

=97 (minutes),

97-94.5=2.5 (points),

Answer: The average score of the five units of mathematics is high, 2.5 points higher.

(2) Through observation and statistics, it is found that Chinese scores are on the rise, while math scores are on the decline.