1. The following is the frequency distribution table of the marks scored by candidates in an examination.
Marks 0-9 10-19 20-29 30-39 40-49 50-59 60-69 70-79 80-89 90-99
frequency 2 7 8 13 24 30 6 5 3 2

A. Make a cumulative frequency table and use it to draw the cumulative frequency curve for the distribution
B. Use your graph to estimate
I. The median mark
II. The lower quartile
III. The upper quartile
IV. The inter quartile range
V. The pass mark if the 60 percent of students passed
VI. The 40th percentile
VII. The 20th percentile
C. Calculate the following
I. Mode
II. Median
III. Standard deviation
IV. Co efficient of variation
V. Skewness

A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V. (C is the capacitance and U is the stored energy.) Answer the following questions regarding the capacitor charged by a battery. For each statement below, select True or False.

With the capacitor connected to the battery, decreasing d increases U. A: True B: False

After being disconnected from the battery, inserting a dielectric with κ will decrease V. A: True B: False

With the capacitor connected to the battery, increasing d increases C. A: True B: False

After being disconnected from the battery, inserting a dielectric with κ will increase C. A: True B: False

With the capacitor connected to the battery, increasing d decreases Q. A: True B: False

After being disconnected from the battery, inserting a dielectric with κ will increase U. A: True B: False

A parallel plate capacitor with plate separation d is connected to a battery. The capacitor is fully charged to Q Coulombs and a voltage of V. (C is the capacitance and U is the stored energy.) Answer the following questions regarding the capacitor charged by a battery. For each statement below, select True or False.

True or False With the capacitor connected to the battery, increasing d decreases Q.
True or False  After being disconnected from the battery, inserting a dielectric with κ will increase U.
True or False  After being disconnected from the battery, inserting a dielectric with κ will decrease C.
True or False With the capacitor connected to the battery, increasing d increases U.
True or False  With the capacitor connected to the battery, increasing d increases C.
True or False  After being disconnected from the battery, inserting a dielectric with κ will decrease V.

POST #1 (ANSWER ONE OF THE QUESTIONS)

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*****DO NOT COPY FROM ANY WEBSITE. USE YOUR OWN WORD. DO NOT ANSWER IF YOU ARE NOT COMFORTABLE FOR ANY RESON.

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***PLEASE JUST ANSWER THE QUESTION. IT NEED TO BE 150 WORDS.

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Instructions:

Watch the following videos, then answer ONE of the questions below: (150 WORDS)

https://www.youtube.com/watch?time_continue=15&v=9Os7LDOOJao

https://www.youtube.com/watch?time_continue=1&v=BzWWL2LXoNk

Discussion Questions:

How was America affected by the Cold War?

Why did the policy of “containment” develop and what were its goals?

How did the fear of Communism and the “red scare” affect American society during the 1950s?

1 Scientific Notation and Units

•Know how to identify the correct number of significant figures in a number .•Know how to work with powers of 10.

•Know the main metric units for mass, distance, force, etc.

•Know how to convert between scales for a unit, eg how many centimeters in akilometer.

2 Motion

2.1 Equations•v=∆x∆t•a=∆v∆t

2.2 Skills

•Understand the relationship between acceleration and velocity, and what kind ofmotion occurs when they are same/opposite.

•Know that average velocity is used when the velocity is not constant

.•Find the distance something travels given a constant acceleration and initial/finalvelocities.

•Find the time something takes to travel a certain distance, given constant acceler-ation and initial/final velocities

•Know key elements of free-fall: g is constant and negative.

1. Assume that you can measure the effects of identical concentration of two inhibitors x and Z, on the K and V M and Vmax of an Enzyme. Which of the following would be consistent with inhibitor X being a more effective inhibitor than Z?

2. Explain why an answer is either wrong/right.

a. Inhibitor X increases KM less than inhibitor Z while neither has an effect on V Max.

b. Inhibitor X decreases KM and VMax two-fold while inhibitor Z decreases both three-fold.

c. Inhibitor X doubles the KM and it decreases VMax by 50% while inhibitor Z triples the KM and it decreases the VMax by 40%.

d. Inhibitor X doubles the KM and it decreases VMax by 50% while inhibitor Z triples the KM and it decreases VMax by 10%.

PLEASE EXPLAIN THOROUGHLY!!!!!!!!!!!!!!!!!

The following table compares the percent sequence homology of four different parts (two introns and two exons) of a gene that is found in five different eukaryotic species. Each part is numbered to indicate its distance from the promoter (for example, Intron I is the one closest to the promoter). The data reported for species A were obtained by comparing DNA from one member of species A to another member of species A.

% Sequence Homology

Compute the minimum changes for each of the characters and list these below.

Intron I            _____________

Exon I              _____________

Intron VI          _____________

Exon V             _____________

How do I solve:

1) A gas system has pressure, moles, and temperature of 0.832 atm, 0.303 moles and 8.000°C, respectively. What is the volume in L?  

2) A gas system has pressure, volume and temperature of 1500 torr, 3.84 L and 277°K, respectively. How many moles of gas are present?  

3) A gas system has a volume, moles and temperature of 8.65L, 0.652 moles and 229°K, respectively. What is the pressure in torr?  

4) A technician measures the voltage drop of 25 V across a 100-Ω resistor using a digital voltmeter. Ohm’s law states that V = IR . What is the current flow (I) through the resistor (R )? How much power (P in Watts)  is consumed by the resistor? (Hint: P = I2R)          (Answer: 250 mA, 6.25 W)  

Design and simulate a regulated power supply using a bridge rectifier, capacitors, and zener diode ( no integrated circuit). The source voltage is 110 plus or minus 10 Vrms, 60 Hz frequency. The output voltage is as follows (plus or minus 5%) : 4.5 V and 12 V

It has to be done on a breadboard. The rating of the adapter will be 12W and 5% regulation. To protect the circuit include a surge protection and fuse in the circuit design. The total cost of the components of the design should be less than $10. A total number of the elements should be less than 12 for reducing environmental impact. Test it on Multisim and breadboard. Please LIST each item that you used on the breadboard test exactly. I NEED YOU TO PERFORM IT ON A BREADBOARD as well as ON MULTISIM. SHOW the multilsim picture. SHOW ALL CALCULATIIONS NEATLY! DO NOT WRITE IN PEN OR CURSIVE! THANK YOU!

The random variable X can take on the values 1, 2 and 3 and the random variable Y can take on the values 1, 3, and 4. The joint probability distribution of X and Y is given in the following table:

a. What value should go in the blank cell?

b. Describe in words and notation the event that has probability 0.2 in the table.

c. Calculate the marginal distribution of X and the marginal distribution of Y.

d. Are X and Y independent events? Show why or why not with calculations.

e. Calculate the conditional distribution of X given Y=1.

f. Calculate E(X) and E(Y).

g. Calculate V(X) and V(Y).

h. Calculate E(X|Y=1).