Four rain gauges A, B, C, and D are placed at the corners of a square region of side 4 km and the fifth rain gauge E is placed at the center of the region. The precipitation measured at each station is given below.
PA = 4.8 cm, PB = 13 cm, PC = 8 cm, PD = 5.4 cm, PE = 9.4 cm
What is the mean precipitation of the region?1
8.6 cm
2
7.6 cm
3
8.2 cm
4
6.6 cm