A Typical Globular Cluster (Image Below)is Composed of 500,000 Stars $\approx$

A typical globular cluster (image below)is composed of 500,000 stars in a sphere whose radius is approximately 15 light-years.The distance between stars in a globular cluster is given approximately by d $\approx$ r/N^1/3,where r is the radius and N is the number of stars in the cluster.Calculate this distance,and determine how many times smaller it is than the typical distance between stars in the solar neighborhood,which is 3 light-years.