Question

There are 12 red checkers and three black checkers in a bag. Checkers are selected one at a time, with replacement. each time the color of the checker is recorded, find the probability of selecting a red checker exactly seven times in 10 selections. Show your work

Answer 1

algebra 1

Answer 2

prob(red) = 12/15 = 4/5
prob(not red) = 1/5

prob( 7 reds of 10)
= C(10,7)(4/5)^7 (1/5)^3
= appr .2013