Maths

 Mean

(15+15+16+15+15+16+15+38) 8

=18.125

Add all values & them divide by the data set

Median

15,15,15,15,15,16,16,38

                 15

Order list & then take the middle value - literalily

Mode

15 - 5

16 - 2

38 - 1

Most frequent value.