Question

A box contains 4 white ribbons and 8 pink ribbons. Determine whether the events of picking a white ribbon and then another white ribbon without replacement are independent or dependent. Then identify the indicated probability.

a. independent; 1/11
b. dependent; 1/12
c. dependent; 1/11
d. independent; 1/12

Answer 1

dependent, 1/11

Explanation:

the probability of picking a white ribbon at first is 1/3

the probability of picking a white ribbon next is 3/11

1/3 * 3/11 = 3/33 = 1/11

it is dependent because picking the first ribbon affects picking the second.