Question

In a survey,3 of 4 students said the courts show too much concern for criminals.find the probability that at most 3 out of 7 randomly selected students will agree with this statement.

Answer 1

Explanation:

p(too much) = 3/4 = 0.75

1-p = 0.25

n = 7 , c = 0, 1 , 2, 3

C(7,0) = 1 C(7,1)=7 C(7,2)=21 C(7,3)=35

p(0) = 1*.75^0*.25^7 = .25^7=.00006

P(1) = 7*.75^1*.25^6 = .00128

P(2) = 21*.75^2*.25^5= .01153

P(3) = 35*.75^3*.25^4= .05768

add them :)