« previous next »

Author Question: Random samples of size 81 are taken from a process (an infinite population) whose mean and standard ... (Read 236 times)

Tazate

  • Hero Member
  • *****
  • Posts: 532
on: Jun 24, 2018
Random samples of size 81 are taken from a process (an infinite population) whose mean and standard deviation are 200 and 18, respectively. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are _____.
 a. 200 and 18
  b. 81 and 18
  c. 9 and 2
  d. 200 and 2

Question 2

The average number of calls received by a switchboard in a 30-minute period is 15.
 a. Define the random variable in words for this experiment.
  b. What is the probability that between 10:00 and 10:30 the switchboard will receive exactly 10 calls?
  c. What is the probability that between 10:00 and 10:30 the switchboard will receive more than 9 calls but fewer than 15 calls?
  d. What is the probability that between 10:00 and 10:30 the switchboard will receive fewer than 7 calls?


cswans24

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

d

Answer to Question 2

a. x = the number of calls received in a 30-minute period
b. .0486
c. .3958
d. .0076


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
« previous next »
 

Did you know?

The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

Did you know?

Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.

Did you know?

Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

Did you know?

It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.

Did you know?

As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.

The nurse is using Standard Precautions to draw blood. The nurse is using Standard Precautions to draw blood.
Standard precaution guidelines. Additional guidelines/protocols may be utilized depending on the ... Standard precaution guidelines. Additional guidelines/protocols may be utilized depending on the ...
How to quickly find the vertex of a quadratic equation that is in standard form How to quickly find the vertex of a quadratic equation that is in standard form
The political process is fraught with opportunities for opponents of climate legislation The political process is fraught with opportunities for opponents of climate legislation
The Plunger and Barrel of a Standard Syringe The Plunger and Barrel of a Standard Syringe
Sample Size Affects Sampling Error Sample Size Affects Sampling Error
Video: Gastrin (gastric emptying) & Secretin (buffering gastric acid)

For a complete list of videos, visit our video library