The following table (see Exercise 5.58) shows the percentages of residents in a large community when classified according to gender and presence of a particular allergy. For each part below, find the mean and standard deviation of the specified random variable.

(a) X stands for the number of persons having the allergy in a random sample of 40 persons.

(b) Y stands for the number of males having the allergy in a random sample of 40 males.

(c) Z stands for the number of females not having the allergy in a random sample of 40 females.

Transcribed Image Text:

Allergy Present Absent Male 16 36 Female 9 39