Why would the average rate of return differ from the internal rate of return on the same

Question:

Why would the average rate of return differ from the internal rate of return on the same project?

Internal Rate of Return
Internal Rate of Return of IRR is a capital budgeting tool that is used to assess the viability of an investment opportunity. IRR is the true rate of return that a project is capable of generating. It is a metric that tells you about the investment...