Neco 2021 Agricultural Science Question 47
Practice objective / multiple choice question 47 from the 2021 Neco Agricultural Science examination.
A 10‑ha cassava field is surveyed by randomly sampling 200 plants, of which 30 show mosaic symptoms. Laboratory testing of the 30 symptomatic plants yields 21 positive results for virus X. The test has a sensitivity of 90 % and a specificity of 95 %. It is known that, among symptomatic plants, 70 % are infected by virus X and 30 % by virus Y. Assuming the sample is representative and that each hectare contains 10 000 plants, estimate the total number of plants in the whole field that are infected with virus X.
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About This Question
This is Neco 2021 Agricultural Science Question 47. It is one of the objective questions from the 2021 Neco Agricultural Science examination.
Difficulty level: Medium .
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