The probability that an audit team will express an inappropriate audit opinion when the financial statements are materially misstated is the definition of audit risk.
When the financial statements are materially misstated, the auditor expresses an inappropriate audit opinion, this risk which an auditor gives is called the audit risk. So, when the auditor fails to modify an opinion on the financial statements it is an audit risk. 
The audit risk will typically rise as an auditor will never be able to obtain absolute assurance by conducting audit procedures. Thus, after identifying the audit risk, auditors are often required to identify the relevant response to these risks.
Hence, the audit risk is a function of the risk of material misstatement.
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