1 of 5 There is a bag with only red marbles and blue marbles.
The probability of randomly choosing a red marble is 7/9
There are 63 marbles in total in the bag and each is equally likely to be chosen.
Work out how many red marbles there must be.

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