From the answer choices, choose the one that best fits a simple random sample. a The names of all the students in the high school are individually written on note cards and placed into the box. The principal chooses five cards, one at a time, for different prizes. b Every fifth person boarding a plane is thoroughly searched. c A teacher randomly selects two boys and two girls from the class to assist in passing back papers. d A college student interviews everyone in a Stats class to determine the percentage of students who use public transportation to get to class.

the answer is c. 23/3

b

step-by-step explanation:

ok thats very interesting

delaney would like to make a 5lb nut mixture that is 60% peanuts and 40% almonds.

she has several pounds of peanuts and several pounds of a mixture that is 20% peanuts and 80% almonds.

let 'p' represent the number of pounds of peanuts needed to make the new mixture, and  

let 'm' represent the number of pounds of the 80% almond-20% peanut mixture.

:

p + m = 5

therefore

m = (5-p)

write an equation based on the percent of peanuts

1p + .2m = .6(5)

replace m with (5-p)

p + .2(5-p) = .6(5)

p + 1 - .2p = 3

p - .2p = 3 - 1

.8p = 2

p = 2/.8

p = 2.5 lbs of peanuts required

then

5 - 2.5 = 2.5 lbs of the peanut/almond mixture required

:

a) what is the system that models this situation?

p + m = 5

1p + .2m = .6(5)