Answer:
A batting average is simply the ratio of hits/at-bats. So, if Karen were up to bat 1,000 times and she got a hit 444 times, that makes her batting average 444/1,000 = .444.
The good news is you can multiply this ratio by number of at bats to get the number of hits.
So, 45 hits x .444 = your answer.
Hope that helps.