Average resistance

Project: Average resistance
A student wants to measure a resistivity of a
material of certain wire of radius 2 mm, and
length of 25 cm. He got the following data
Voltage (V): 100, 90, 80, 70, 60, 50, 40, 30, 20, 7
Current (A): 11, 8, 7, 6, 5.7,5, 3.9, 2.3, 2.1, 1.1
Find the avg?