Sarafina had 34 out of 99 hits.
We need to find her average. We know
34 hits out of 99 hits in all
x = Average value
34 = x * 99
34 = 99x
Divide both sides by 99

0.3434343 = x (0.343434… is a repeating , so we need to round off to the nearest hundreds)
Average = 0.34