Answer: The fraction of the days on which the quiz has been held expressed as a decimal is 0.325
Explanation:
Decimal numbers are not considered as integers. They are rounded off to write an integer.
Fraction is present in the form of
where

We are given:
Number of days, the class had quiz = 13
Total number of days = 40
The fraction becomes:

Expression this as a decimal = 0.325
Hence, the fraction of the days on which the quiz has been held expressed as a decimal is 0.325