Binomial PDF - Quick Review

A test consists of 10 multiple choice questions with five choices for each question.  As an experiment, you GUESS on each and every answer without even reading the questions. 
What is the probability of getting exactly 6 questions correct on this test?

• 0.6%
• 0.00001%
• 0.0064%
• 0.0002%

The American Red Cross says that about 11% of the U.S. population has Type B blood. A blood drive is being held at your school.What is the probability that exactly 2 of the first 20 blood donors have Type B blood? 

• 0.316
• 0.282
• 0.001
• Not here

An algebra 2 test has 6 multiple choice questions with four choices with one correct answer each. If we just randomly guess on each of the 6 questions, what is the probability that you get exactly 5 questions correct? (You need to figure out the p value first. It is not given to you.)

• 0.962

• 0.004

• 0.831

• 0.250

Tags

CCSS.HSS.MD.B.6

CCSS.HSS.MD.B.7

Salim has a flock of 300 chickens, 15% of which are infected with a virus. He plans on taking an SRS (simple random sample) of 7.
Find the probability that exactly 4 of the 7 chickens sampled have the virus.

Write your answer in 3 significant figures. 

Tags

CCSS.HSS.MD.B.6

CCSS.HSS.MD.B.7