How to find the value of the 5th Eigenvalue based on information above? If so , explain how. If not, explain what other information is needed.

#1
I need some help on this questions

The correlation matrix of a data set up with p=5 variables and n=312 observations is analysed. The first 4 eigenvalues(in descending values)are 2.7, 1.5, 0.5 and 0.2.

Can we find the value of the 5th Eigenvalue based on information above? If so , explain
how. If not, explain what other information is needed.

Anyhow could let me know how to get started on this and any reference will help me to understand on this.