That is pretty normal for the very first ping. Not sure exactly what it is doing but you will see that all the time. You need to run continuous ping and see if you get other random ones. It is caused by many many things anything from local wireless interference to ISP having issues in the network.
Unless it is something in your house on your equipment there is little you can do. The ISP will not promise any latency..they will not even promise any minimum bandwidth in most cases.