Complete the following statements.
the sum of two rational numbers is
number because adding two rational numbers is equivalent to adding two
fractions, which is
under addition
the product of two rational numbers is
number because multiplying two rational numbers is equivalent to
multiplying two fractions which is
under multiplication,

The mean finish time was 185.52 with a standard deviation of 0.327 minute. the winning car driven by chris finished in 185.13. the previous year race had a mean finish time of 110.3 with a standard deviation of 0.106. the winning car that year driven by karen finished in 110.13 minutes. find their respective z-scores. chris - z-score karen “- z-score