« previous next »

Author Question: For a normal curve, if the mean is 20 minutes and the standard deviation is 5 minutes, find the area ... (Read 109 times)

Marty

  • Hero Member
  • *****
  • Posts: 553
on: Jun 24, 2018
For a normal curve, if the mean is 20 minutes and the standard deviation is 5 minutes, find the area to the right of 12 minutes.

Question 2

The publisher of a daily newspaper claims that 90 of its subscribers are under the age of 30 . Suppose that a sample of 300 subscribers is selected at random. Assuming the claim is correct, approximate the probability of finding at least 240 subscribers in the sample under the age of 30.


31809pancho

  • Sr. Member
  • ****
  • Posts: 317
Reply #1 on: Jun 24, 2018
Answer to Question 1

0.9452

Answer to Question 2

1


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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?

The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

Did you know?

Stevens-Johnson syndrome and Toxic Epidermal Necrolysis syndrome are life-threatening reactions that can result in death. Complications include permanent blindness, dry-eye syndrome, lung damage, photophobia, asthma, chronic obstructive pulmonary disease, permanent loss of nail beds, scarring of mucous membranes, arthritis, and chronic fatigue syndrome. Many patients' pores scar shut, causing them to retain heat.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Human immunodeficiency virus gains entry into helper T cells, uses the cell DNA to replicate, interf Human immunodeficiency virus gains entry into helper T cells, uses the cell DNA to replicate, interf
When children are “launched” into independence, their parents often find new interests together ... When children are “launched” into independence, their parents often find new interests together ...
Two areas of reduced cortical volume and one area of increased cortical volume observed in people ... Two areas of reduced cortical volume and one area of increased cortical volume observed in people ...
How did you give birth? C section vs. Normal Delivery How did you give birth? C section vs. Normal Delivery
The European Alps have lost ~30% to 40% of surface area and ~50% of volume since the 1850s. The European Alps have lost ~30% to 40% of surface area and ~50% of volume since the 1850s.
Assume z is a standard normal random variable. What is the value of z if the area to the right ... Assume z is a standard normal random variable. What is the value of z if the area to the right ...
Video: Introduction to Epilepsy

For a complete list of videos, visit our video library