A very large number of Aedes mosquito larvae are on the surface of a river, scattered randomly so that the number of larvae is, on average, 3 per square cm. For a study of the spread of the Zika virus, a small circular net of radius 1 cm is placed in the water and the larvae in that area collected. G 1 cm Figure 1: The net used for collecting mosquito larvae (a) Find the probability that more than 5 larvae are collected in the net. (b) When 10 nets are used, what is the probability that exactly eight of the nets have more than 5 larvae. (c) Let T be the total number of larvae in four nets. What is the distribution of T? (d) Examine the assumptions leading to the Poisson Process and indicate which may not hold in this case, explaining why.

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Chapter1: Combinatorial Analysis
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3. A very large number of Aedes mosquito larvae are on the surface of a river, scattered randomly so that
the number of larvae is, on average, 3 per square cm. For a study of the spread of the Zika virus, a
small circular net of radius 1 cm is placed in the water and the larvae in that area collected.
1 cm
G
Figure 1: The net used for collecting mosquito larvae
(a) Find the probability that more than 5 larvae are collected in the net.
(b) When 10 nets are used, what is the probability that exactly eight of the nets have more than 5
larvae.
(c) Let T be the total number of larvae in four nets. What is the distribution of T?
(d) Examine the assumptions leading to the Poisson Process and indicate which may not hold in this
case, explaining why.
Transcribed Image Text:3. A very large number of Aedes mosquito larvae are on the surface of a river, scattered randomly so that the number of larvae is, on average, 3 per square cm. For a study of the spread of the Zika virus, a small circular net of radius 1 cm is placed in the water and the larvae in that area collected. 1 cm G Figure 1: The net used for collecting mosquito larvae (a) Find the probability that more than 5 larvae are collected in the net. (b) When 10 nets are used, what is the probability that exactly eight of the nets have more than 5 larvae. (c) Let T be the total number of larvae in four nets. What is the distribution of T? (d) Examine the assumptions leading to the Poisson Process and indicate which may not hold in this case, explaining why.
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