Solution:
we are given that
The radio station manager will award a free stereo to a contest winner. There are 20 black stereos, 15 white stereos, 10 red stereos, and 5 silver stereos to choose from.
we have been asked to find
The probability that the stereo randomly selected by the contest winner is NOT white?
Total number of stereo=50
Total number of white stereo=15
1 can nbe chosen out of 50 in [tex] {50}_C_1 [/tex] ways.
1 can nbe chosen out of 15 in [tex] {15}_C_1 [/tex] ways.
So the probability that the chosen sterio is white [tex] =\frac{ {15}_C_1 }{{50}_C_1} =0.3\\ [/tex]
So the probability that the chosen sterio isNOT white [tex] =1-0.3=0.7 [/tex]
