Albino rats used to study the hormonal regulation of a metabolic pathway are injected with a drug that inhibits body synthesis of protein. Usually, 4 out of 20 rats die from the drug before the experiment is over. This time round, 10 animals are treated with the drug. What is the probability of a failure?
20%
0.2
40%
0.8
Geeneen van bostaande / None of the above
4/20 = 2/10 = 0.2
Ik versta wel.
By the way I am assuming that death is a failure ;)
jhknlm
To calculate the probability of a failure, we need to determine the number of rats that are expected to die out of the 10 that were treated with the drug.
From the given information, we know that normally 4 out of 20 rats die from the drug before the experiment is over. We can express this as a ratio: 4/20 = 0.2 (or 20%).
To determine the expected number of rats that will die, we can multiply this ratio by the number of rats treated with the drug in this experiment (10). So, the expected number of rats that will die is 0.2 * 10 = 2.
Therefore, the probability of a failure (i.e., a rat dying from the drug) is 2 out of 10, which can be expressed as 2/10 or 0.2 (or 20%).
So the correct answer is: 20%