*4.41 What is the expected number of otitis-prone families of 100 five-sibling families?

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Please answer only 4.41
TABLE 4.16
0123456
7
8
9
10
11
12
Number of infants (of 2500) who
remain disease-free at the end of each
month during the first year of life
Disease-free infants at
the end of month i
2500
2425
2375
2300
2180
2000
1875
1700
1500
1300
1250 I
1225
1200
*4.40 Suppose an "otitis-prone family" is defined as one
in which at least three siblings of five develop otitis media
in the first 6 months of life. What proportion of five-sibling
families is otitis prone if we assume the disease occurs in-
dependently for different siblings in a family?
*4.41 What is the expected number of otitis-prone families
of 100 five-sibling families?
Transcribed Image Text:TABLE 4.16 0123456 7 8 9 10 11 12 Number of infants (of 2500) who remain disease-free at the end of each month during the first year of life Disease-free infants at the end of month i 2500 2425 2375 2300 2180 2000 1875 1700 1500 1300 1250 I 1225 1200 *4.40 Suppose an "otitis-prone family" is defined as one in which at least three siblings of five develop otitis media in the first 6 months of life. What proportion of five-sibling families is otitis prone if we assume the disease occurs in- dependently for different siblings in a family? *4.41 What is the expected number of otitis-prone families of 100 five-sibling families?
Pediatrics, Otolaryngology
Otitis media is a disease that occurs frequently in the first
few years of life and is one of the most common reasons
for physician visits after the routine checkup. A study was
conducted to assess the frequency of otitis media in the
general population in the first year of life. Table 4.16 gives
the number of infants of 2500 infants who were first seen at
birth who remained disease-free by the end of the ith month
of life, i = 0, 1, . . . , 12. (Assume no infants have been lost
to follow-up.)
*4.38 What is the probability that an infant will have one or
more episodes of otitis media by the end of the sixth month
of life? The first year of life?
*4.39 What is the probability that an infant will have one or
more episodes of otitis media by the end of the ninth month
of life given that no episodes have been observed by the
end of the third month of life?
Transcribed Image Text:Pediatrics, Otolaryngology Otitis media is a disease that occurs frequently in the first few years of life and is one of the most common reasons for physician visits after the routine checkup. A study was conducted to assess the frequency of otitis media in the general population in the first year of life. Table 4.16 gives the number of infants of 2500 infants who were first seen at birth who remained disease-free by the end of the ith month of life, i = 0, 1, . . . , 12. (Assume no infants have been lost to follow-up.) *4.38 What is the probability that an infant will have one or more episodes of otitis media by the end of the sixth month of life? The first year of life? *4.39 What is the probability that an infant will have one or more episodes of otitis media by the end of the ninth month of life given that no episodes have been observed by the end of the third month of life?
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