Answer Happy

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"† 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.
(a) What is the probability that the size of a single droplet is
less than 1485 µm? At least 950 µm? (Round your
answers to four decimal places.)
(b) What is the probability that the size of a single droplet is
between 950 and 1485 µm? (Round your answer to
four decimal places.)


(c) How would you characterize the smallest 2% of all droplets?
(Round your answer to two decimal places.)
The smallest 2% of droplets are those smaller than µm
in size.
(d) If the sizes of five independently selected droplets are
measured, what is the probability that at least one
exceeds 1485 µm? (Round your answer to four decimal
places.)