In the context of the co-toxicity factor formula, the term "expected mortality" refers to the predicted or estimated mortality rate of an organism under the combined effects of multiple toxic substances. The co-toxicity factor formula is used to assess the combined toxicity of different substances on an organism, taking into account their toxicities.

To calculate the expected mortality using the co-toxicity factor formula, you typically follow these steps:

It's important to note that the co-toxicity factor formula is a simplified approach to assess combined toxicity and may not account for all possible interactions between substances. The formula assumes an additive or independent effect of the substances. In reality, interactions between substances can be more complex, including synergistic (enhanced) or antagonistic (reduced) effects.

Furthermore, the specific formula or equation used for calculating the co-toxicity factor may vary depending on the context, study design, and toxicological data available. It is essential to consult relevant literature, regulatory guidelines, or expert advice to ensure the appropriate use of the co-toxicity factor formula and interpretation of the results in your specific research or assessment.