What conclusion can the student draw from these data regarding the charge of the electron?

Question

Millikan determined the charge on the electron by studying the static charges on oil drops falling in an electric field. A student carried out this experiment using several oil drops for her measurements and calculated the charges on the drops. She obtained the following data:
Droplet
Calculated Charge (C)
A
1.60×10^-19
B
3.15×10^-19
C
4.81×10-19
D
6.31×10^-19

Answer 1

Look at the charge differences between the droplets

 

A->B: 1.55x10^–19C

B->C: 1.66x10^–19C

C->D: 1.501x0^–19C

 

The charge difference between the droplets is essentially the same from one droplet to the next. This must mean that there is a one particle difference between each drop (i.e. one additional electron for each drop)

 

On average, the charge difference is 1.55x10^–19C, which is very close to the currently accepted value of 1.60x10^–19C.

 

I hope this makes sense.