Dust mite allergies. A dust mite allergen level that exceeds 2 micrograms per gram (µg/g) of dust has been associated with the development of allergies. Consider a random sample of four homes and let Y be the number of homes with a dust mite level that exceeds 2 µg/g. The probability distribution for Y = y, based on a study by the National Institute of Environmental Health Sciences, is shown in the following table. y 1 2 3 4 PV) .09 30 .37 .20 .04 Dust mite allergies. Exercise 4.2 (p. 138) gives the proba- bility distribution for the number Y of homes with high dust mite levels. a. Find E(Y). Give a meaningful interpretation of the result. b. Find o. c. Find the exact probability that Y = y is in the interval u ± 20. Compare to Chebyshev's Rule and the Empir- ical Rule.

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3. Dust mite allergies. A dust mite allergen level that exceeds
2 micrograms per gram (ug/g) of dust has been associated
with the development of allergies. Consider a random
sample of four homes and let Y be the number of homes
with a dust mite level that exceeds 2 µg/g. The probability
distribution for Y = y, based on a study by the National
Institute of Environmental Health Sciences, is shown in
the following table.
y
1
2
3
4
P(y)
.09
.30
.37
.20
.04
Dust mite allergies. Exercise 4.2 (p. 138) gives the proba-
bility distribution for the number Y of homes with high
dust mite levels.
a. Find E(Y). Give a meaningful interpretation of the result.
b. Find o.
c. Find the exact probability that Y = y is in the interval
u ± 20. Compare to Chebyshev's Rule and the Empir-
ical Rule.
Transcribed Image Text:3. Dust mite allergies. A dust mite allergen level that exceeds 2 micrograms per gram (ug/g) of dust has been associated with the development of allergies. Consider a random sample of four homes and let Y be the number of homes with a dust mite level that exceeds 2 µg/g. The probability distribution for Y = y, based on a study by the National Institute of Environmental Health Sciences, is shown in the following table. y 1 2 3 4 P(y) .09 .30 .37 .20 .04 Dust mite allergies. Exercise 4.2 (p. 138) gives the proba- bility distribution for the number Y of homes with high dust mite levels. a. Find E(Y). Give a meaningful interpretation of the result. b. Find o. c. Find the exact probability that Y = y is in the interval u ± 20. Compare to Chebyshev's Rule and the Empir- ical Rule.
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