Considering it's concept and the tree diagram, the probability of an incorrect test result is of 0.08.
<h3>What is a probability?</h3>
A probability is given by the <u>number of desired outcomes divided by the number of total outcomes</u>.
An incorrect result is a negative with pet allergy, or a positive without allergy, hence the probabilities at the tree diagram are:
Hence the probability is given by:
p = 0.19 x 0.18 + 0.06 x 0.82 = 0.0834.
To two decimal places, 0.08 probability, as 34 < 50.
More can be learned about probabilities at brainly.com/question/14398287
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