10. Medical records at a doctor's office reveal that 12% of adult patients have seasonal
allergies. Select a random sample of 100 adult patients and let y = the number of
individuals in the sample who have allergies.

a) Calculate the mean and standard deviation of the sampling distribution of Y.

b) Interpret the standard deviation from part (a)

c) Would it be appropriate to use a normal distribution to model the sampling distribution of
Y? Justify your answer.
Math

secant-secant formula:

(whole secant) x (external part) =           (whole secant) x (external part)

(8+y-2) *8=                                           (y+4+6) *6

(y+6)*8 = (y+10) *6

distribute

8y+48 = 6y +60

subtract 6y from each side

2y +48 = 60

subtract 48 from each side

2y = 12

divide by 2

y = 6

sv =     (y+4+6)

sv   = 6+4+6

sv = 16

i may be incorrect but i believe that her first error was in step one when she multiplyed her equation by 1/4 when she should have divided it by 1/4