This topic contains a solution. Click here to go to the answer

Author Question: What is the probability that the man doesn't work and the woman works? What will be an ideal ... (Read 68 times)

craiczarry

  • Hero Member
  • *****
  • Posts: 527
What is the probability that the man doesn't work and the woman works?
 
  What will be an ideal response?

Question 2

For a particular aptitude test, the mean score was 83.2. Suppose you were told that your score of 87 placed you in the 85th percentile. Assuming the data is bell-shaped, provide an estimate of the standard deviation of the test.
 
  What will be an ideal response?



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Joy Chen

  • Sr. Member
  • ****
  • Posts: 354
Answer to Question 1

P(both man and woman are not working) = 1 - 0.88 = 0.12
P(woman doesn't work  man doesn't work) = 0.40
P(man does not work) = P(both man and woman are not working)/0.40
= 0.12/0.40 = 0.30
P(man does not work) = P(man doesn't work and woman doesn't work)+
P(man doesn't work and woman works)
Then, 0.30 = 0.12 + P(man doesn't work and woman works)
Hence, P(man doesn't work and woman works) = 0.30 - 0.12 = 0.18

Answer to Question 2

At the 85th percentile, you outperformed more than 68 of the class, so we know that you scored more than 1 standard deviation above the mean. Therefore the standard deviation must be less than 87 - 83.2 or 3.8 points.





 

Did you know?

Congestive heart failure is a serious disorder that carries a reduced life expectancy. Heart failure is usually a chronic illness, and it may worsen with infection or other physical stressors.

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Did you know?

Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.

Did you know?

In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

Did you know?

Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

For a complete list of videos, visit our video library