Can someone just please answer this question please. With correct answer.

Lydia collected two sets of data one set of data shows an outlier. which set has an outlier, and which number is the outlier?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?