Activity 1: Answer the following. 1. What are the benefits of VoIP? 2. How the voice is digitized and packetized? 3. What is conversation traffic and control traffic? 4. What are the components of IP Telephony system? 5. Brief on voice compression and coding techniques.

a. Consider the following distribution of a random variable X

                Find the mean, variance and standard deviation

b. There are 6 Republican, 5 Democrat, and 4 Independent candidates. Find the probability the committee will be made of 3 Republicans, 2 Democrats, and 2 Independent be selected?

c. At a large university, the probability that a student takes calculus and is on the dean’s list is 0.042. The probability that a student is on the dean’s list is 0.21. Find the probability that the student is taking calculus given that the student is on the dean’s list.

d. In a statistics class there are 16 juniors and 12 seniors; 8 of the senior students are females, and 12 of the juniors are males. If a student is selected at random, find the probability that the student is neither a junior nor a male.

Question 1: Motherboard can be ordered in lots of 1, 2, or 3 units. The random variable is the number of units ordered by a customer with the following probability mass function:

1. Find the value of k.
2. Calculate the probability of between 3 and 5 (inclusive) units are ordered.
3. Calculate the probability of more than 3 units are ordered.
4. Calculate the mean and standard deviation of the distribution

1) A demographer wants to measure life expectancy in countries 1 and 2. Let μ1 and μ2 denote the mean life expectancy in countries 1 and 2, respectively. Specify the hypothesis to determine if life expectancy in country 1 is more than 10 years lower than in country 2.

A) H0:μ1– μ2≤10, HA:μ1– μ2>10

B) H0:μ1– μ2≥10, HA: μ1– μ2<10

C)H0:μ1– μ2≤–10, HA:μ1– μ2>−10

D)H0:μ1– μ2≥–10, HA:μ1– μ2<−10

2) A restaurant chain has two locations in a medium-sized town and, believing that it has oversaturated the market for its food, is considering closing one of the restaurants. The manager of the restaurant with a downtown location claims that his restaurant generates more revenue than the sister restaurant by the freeway. The CEO of this company, wishing to test this claim, randomly selects 36 monthly revenue totals for each restaurant. The revenue data from the downtown restaurant have a mean of $360,000 and a standard deviation of $50,000, while the data from the restaurant by the freeway have a mean of $340,000 and a standard deviation of $40,000. Assume there is no reason to believe the population standard deviations are equal, and let μ1 and μ2 denote the mean monthly revenue of the downtown restaurant and the restaurant by the freeway, respectively. Which of the following hypotheses should be used to test the manager's claim?

A) H0:μ1– μ2≤0, HA:μ1– μ2>0

B) H0:μ1– μ2 ≥0 , HA:μ1– μ2<0

C) H0:μ1– μ2=0, HA:μ1– μ2≠0

D) H0:μ1– μ2>0, HA:μ1– μ2≤0

3) what the formula for the sample variance s2 when used as an estimate of σ2 for a random sample of n observations from a population?

4)What is the formula for the sample variance s2 when used as an estimate of σ2 for a random sample of n observations from a population? 46)  A financial analyst examines the performance of two mutual funds and claims that the variances of the annual returns for the bond funds differ. To support his claim, he collects dataon the annual returns (in percent) for the years 2001 through 2010. The analyst assumes that the annual returns for the two emerging market bond funds are normally distributed. Use the following summary statistics.

For the competing hypotheses Η0: σ1^2/ σ2^2=1, ΗA:σ1^2/ σ2^2≠ 1, which of the following is the correct approximation of the p-value?

A) Less than 0.01

B) Between 0.01 and 0.025

C) Between 0.02 and 0.05

D) Between 0.05 and 0.1

5) ) The following table shows the distribution of employees in an organization. Martha Foreman,an analyst, wants to see if race has a bearing on the position a person holds with this company

Using the p-value approach and α= 0.05, the decision and conclusion are ________.

A) reject the null hypothesis; conclude race and seniority are dependent

B) reject the null hypothesis; conclude race and seniority are independent

C) do not reject the null hypothesis; cannot conclude race and seniority are dependent

D) do not reject the null hypothesis; conclude race and seniority are independent

Question 1
2 pts
(TCO 1) Which of the following is not a necessary life function?

Nutrients

Maintaining boundaries

Responsiveness

Metabolism

Movement

Question 2
2 pts
(TCO 1) In describing the relationship of the thoracic and spinal cavities,

the thoracic cavity is ventral to the spinal cavity.

the thoracic cavity is inferior to the spinal cavity.

the thoracic cavity is superior to the spinal cavity.

the thoracic cavity is proximal to the spinal cavity.

the thoracic cavity is medial to the spinal cavity.

Question 3
2 pts
(TCO 1) The stomach, liver, intestines, bladder, rectum, and reproductive organs are housed in the

dorsal cavity.

thoracic cavity.

abdominopelvic cavity.

spinal cavity.

cranial cavity.

Question 4
2 pts
(TCO 1) Which type of section could be used to separate the thoracic cavity from the abdominopelvic cavity?

Sagittal

Dorsal

Transverse

Coronal

Ventral

Question 5
2 pts
(TCO 1) Which of the following orientation terms have opposite meanings (in humans)?

Distal and proximal

Posterior and intermediate

Medial and distal

Superficial and proximal

Medial and anterior

Question 6
2 pts
(TCO 1) A coronal section through the human body can

pass through both the nose and the occipital region.

pass through both ears.

provide mirror right and left images.

lie in a horizontal plane.

divide the right arm into a left side and a right side when the body is in the anatomical position.

Question 7
2 pts
(TCO 2) Ninety-six percent of the human body is composed of the elements

sodium, potassium, hydrogen, and sulfur.

carbon, oxygen, hydrogen, and nitrogen.

calcium, magnesium, potassium, and iron.

carbon, oxygen, iron, and potassium.

carbon, calcium, sodium, and oxygen.

Question 8
2 pts
(TCO 2) When a pair of electrons is shared equally between two atoms, the bond formed is called a(n)

hydrogen bond.

carbon bond.

polar covalent bond.

ionic bond.

nonpolar covalent bond.

Question 9
2 pts
(TCO 2) Which of the following statements is correct regarding the electrical charge of subatomic particles?

Protons are negatively charged, electrons are positively charged, and neutrons are neutral.

Protons are negatively charged, electrons are neutral, and neutrons are negatively charged.

Protons are positively charged, electrons are negatively charged, and neutrons are neutral.

Protons are neutral, electrons are negatively charged, and neutrons are positively charged.

Protons are positively charged, electrons are neutral, and neutrons are negatively charged.

Question 10
2 pts
(TCO 2) Glucose and starch are examples of

triglycerides.

proteins.

carbohydrates.

steroids.

phospholipids.

Question 11
2 pts
(TCO 2) Which of the following substances below is matched with its correct organic group?

DNA—lipids

Steroids—carbohydrates

Monosaccharides—nucleic acids

Glycerol—proteins

Enzymes—proteins

Question 12
2 pts
(TCO 2) Which of the following statements about enzymes is true?

They are not reusable.

They are carbohydrates.

They are required in large amounts in order to be effective.

They are stable at high temperatures.

They are biological catalysts.

Machine 1:

- Saves nothing in year 1
- Save you $2,000 in year 2
- Saves $1,000 in year 3
- Assume 5%

What is the PV of the savings for machine 1?

Machine 2:

- Saves nothing in year 1
- Save you $1,000 in year 2
- Saves $2,000 in year 3
- Assume 5%

What is the PV of the savings for machine 2?

Based on the PV of the savings for each machine, which would you buy?

1. (Covering part 1 of the lecture slides)

Consider the subset A of natural numbers, defined by A={ all natural numbers n : n is congruent to 1 (mod 3) }

First consider G: N -------> {0,1} to be the characteristic function of A.

a) Determine G(23) and G(25)

b) determine which sequence of 0,1 is this set associated with. (Write about 9 terms of it, or describe it with a formula.)

c) Which real number in the interval (0,1) in base 2 is associated with this set?  

A car wash has two stations, 1 and 2. The service time at station 1 is exponentially distributed with parameter λ1, and the service time at station 2 is exponentially distributed with parameter λ2.When a car arrives at the car wash, it begins service at station 1, provided station 1 is free; otherwise, the car waits until station 1 is available. Upon completing service at station 1, the car then proceeds to station 2, provided station 2 is free; otherwise, the car has to wait at station 1, blocking other cars from receiving service at station 1. The car exits thecarwash after service at station 2 is completed. Different cars are independent of each other, and for any car, the service time at station 1 is independent of the service time at station 2.When you arrive, there is only one car at the car wash, and it is receiving service at station 1.Compute the expected time from your arrival until your exit from the car wash.

1) Only 1% of the filtrate leaves the body as urine. True or False

2) Perineal structures in the female reproductive system include the [a] and the [b]

3) The ---------- is the main processor of drugs in the body.

answer all three questions please. just the right answers only. thanks