Practice Exercises

DIRECTION: Answer the following problems

on Binomial Distribution.

1. A coin is tossed twice find the probability of

getting at least one head.

2. Some field representative of the

Environmental Protection Agency are doing

spot checks of water pollution in streams.

Historically, 8 out of 10 such tests produce

favorable results, that is, no pollution. The field

group is going to perform 6 tests and wants to

know the chances of getting exactly 3

favorable results from this group of tests.

3. The probability that a patient recovers from

a rare blood disease is 0.40. If 15 people are

known to have contracted this disease, what is

the probability that at most 3 survive?

4. A multiple-choice quiz has 15 questions,

each with 4 possible answers of which only 1

is the correct answer. What is the probability

that a student get 1 incorrect answer?

Practice Exercises

DIRECTION: Answer the following problems

on Poisson Distribution.

1. On the average a certain intersection results

in 3 traffic accidents per month. What is the

probability that in any given month at this

intersection:

a. exactly 5 accidents will occur?

b. less than 3 accidents will occur?

2. A secretary makes 2 errors per page on the

average. What is the probability that on the

next page she makes 4 or more errors?