What are the answers to these questions?

The president of a bowling league wanted to estimate the average highest bowling score of all its 200 members. instead of surveying all 200 members, she randomly selected 20 members and recorded their highest scores. she found the sample mean to be 237. what inference can she make based on the sample mean?

With these: 18/36 = 1/? missing number change 1 5/8 to improper fraction. change 19/5 to a mixed number.

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?