MIRAMAR COLLEGE/SUMMER 2020 MATH 119
1
MATH 119 WORKSHEET 4
Prof. To
ez NAME: _________________________________________________________
1. In a world-wide study of counterfeit US bills, bills from 30 large cities were analyzed. Here are the results: 175
of the bills were verified as counterfeit while 218,955 were not counterfeit. If a bill is randomly selected, find the
probability that it is counterfeit.
2. If there is upwards of $1.55 trillion in US cu
ency circulating globally, calculate the value of counterfeit bills.
SOLUTION:
3. Nokia supplies mobile phones in lots of 25, and they have a reported defective rate of 0.075%. What is the
probability of an individual phone being defective? If a quality control engineer wants to carefully analyze a
defective mobile phone, what is the probability of her getting at least one defective phone in a lot of 25? Is the
probability high enough that the engineer can be reasonably sure of getting a defective mobile phone that can be
used for her analysis?
SOLUTION:
SOLUTION: