Spray drift is a constant concern for pesticide applicators and agricultural producers. The inverse relationship between droplet size and drift potential is well known. The paper "Effects of 2,4-D Formulation and Quinclorac on Spray Droplet Size and Deposition"t investigated the effects of herbicide formulation on spray atomization. A figure in a paper suggested the normal distribution with mean 1050 µm and standard deviation 150 µm was a reasonable model for droplet size for water (the "control treatment") sprayed through a 760 ml/min nozzle.

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**Spray Drift and Droplet Size Probability Analysis**

Spray drift is a key concern for pesticide applicators and agricultural producers. Understanding the inverse relationship between droplet size and drift potential is crucial. A study titled "Effects of 2,4-D Formulation and Quinclorac on Spray Droplet Size and Deposition" explored the effect of herbicide formulation on spray atomization. In this context, a normal distribution with a mean droplet size of 1050 μm and a standard deviation of 150 μm serves as a model for water droplets sprayed through a 760 ml/min nozzle.

**Probability Questions**

**(a)** Probability that the size of a single droplet is less than 1485 μm:

- **Less than 1485 μm**: Probability = 0.9981
- **At least 975 μm**: Probability = 0.6915

**(b)** Probability that the size of a single droplet is between 975 and 1485 μm: 

- Probability = 0.6896

**(c)** Characterization of the smallest 2% of all droplets:

- The smallest 2% of droplets are those smaller than a certain μm size, which is yet to be determined.

**(d)** If the sizes of five independently selected droplets are measured, the probability that at least one exceeds 1485 μm:

- Probability = 0.0013 (Incorrect calculation noticed)

You may need to refer to the appropriate tables for statistical calculations to answer these questions accurately.
Transcribed Image Text:**Spray Drift and Droplet Size Probability Analysis** Spray drift is a key concern for pesticide applicators and agricultural producers. Understanding the inverse relationship between droplet size and drift potential is crucial. A study titled "Effects of 2,4-D Formulation and Quinclorac on Spray Droplet Size and Deposition" explored the effect of herbicide formulation on spray atomization. In this context, a normal distribution with a mean droplet size of 1050 μm and a standard deviation of 150 μm serves as a model for water droplets sprayed through a 760 ml/min nozzle. **Probability Questions** **(a)** Probability that the size of a single droplet is less than 1485 μm: - **Less than 1485 μm**: Probability = 0.9981 - **At least 975 μm**: Probability = 0.6915 **(b)** Probability that the size of a single droplet is between 975 and 1485 μm: - Probability = 0.6896 **(c)** Characterization of the smallest 2% of all droplets: - The smallest 2% of droplets are those smaller than a certain μm size, which is yet to be determined. **(d)** If the sizes of five independently selected droplets are measured, the probability that at least one exceeds 1485 μm: - Probability = 0.0013 (Incorrect calculation noticed) You may need to refer to the appropriate tables for statistical calculations to answer these questions accurately.
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