The graph indicates that a significant portion of risks, 29%, have not been mitigated, which suggests that these are either failed tests or other discovered failures. This level of unmitigated risk puts the project at risk, as it implies that there are still substantial issues that need to be addressed.
References:The ISTQB Advanced Level Test Manager documents outline the importance of risk-based testing and the interpretation of residual risk graphs. These graphs are used to communicate the current status of risk mitigation efforts in the project, and a high percentage of unmitigated risks is a clear indicator of potential problems1.

Being the developer of testing tools used for automation is likely to develop the necessary skills to effectively test a software system because it involves a deep understanding of testing processes and the creation of tools that facilitate these processes. This experience provides insight into the intricacies of test automation, which is crucial for designing effective tests and ensuring thorough coverage of the system under test.
References: The current page suggests referring to the ISTQB Advanced Level Test Manager Syllabus and other ISTQB documents for a comprehensive understanding of the roles and skills required for effective software testing. It emphasizes the importance of alignment of methodologies in distributed testing models, which is relevant to the development and use of testing tools.