Multiple Choice

Oxnard Casualty wants to ensure that their e-mail server has 99.98 percent reliability. They will use several independent server

sattari [20]

Answer:

The smallest number of servers required is 3 servers

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Explanation:

Given

$Reliability = 99.98\%$

$Individual Servers = 95\%$

Required

Minimum number of servers needed

Let p represent the probability that a server is reliable and the probability that it wont be reliable be represented with q

Such that

$p = 95\%\\$

It should be noted that probabilities always add up to 1;

So,

$p + q = 1$ '

Subtract p from both sides

$p - p + q = 1 - p$

$q = 1 - p$

Substitute $p = 95\%\\$

$q = 1 - 95\%$

Convert % to fraction

$q = 1 - \frac{95}{100}$

Convert fraction to decimal

$q = 1 - 0.95$

$q = 0.05$

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<em>To get an expression for one server</em>

The probabilities of 1 servers having 99.98% reliability is as follows;

$p = 99.98\%$

Recall that probabilities always add up to 1;

So,

$p + q = 1$

Subtract q from both sides

$p + q - q = 1 - q$

$p = 1 - q$

So,

$p = 1 - q = 99.98\%$

$1 - q = 99.98\%$

Let the number of servers be represented with n

The above expression becomes

$1 - q^n = 99.98\%$

Convert percent to fraction

$1 - q^n = \frac{9998}{10000}$

Convert fraction to decimal

$1 - q^n = 0.9998$

Add $q^n$ to both sides

$1 - q^n + q^n= 0.9998 + q^n$

$1 = 0.9998 + q^n$

Subtract 0.9998 from both sides

$1 - 0.9998 = 0.9998 - 0.9998 + q^n$

$1 - 0.9998 = q^n$

$0.0002 = q^n$

Recall that $q = 0.05$

So, the expression becomes

$0.0002 = 0.05^n$

Take Log of both sides

$Log(0.0002) = Log(0.05^n)$

From laws of logarithm $Loga^b = bLoga$

So,

$Log(0.0002) = Log(0.05^n)$ becomes

$Log(0.0002) = nLog(0.05)$

Divide both sides by $Log0.05$

$\frac{Log(0.0002)}{Log(0.05)} = \frac{nLog(0.05)}{Log(0.05)}$

$\frac{Log(0.0002)}{Log(0.05)} = n$

$n = \frac{Log(0.0002)}{Log(0.05)}$

$n = \frac{-3.69897000434}{-1.30102999566}$

$n = 2.84310893421$

$n = 3 (Approximated)$

<em>Hence, the smallest number of servers required is 3 servers</em>

6 0

3 years ago

Write pseudo code that performs the following: Ask a user to enter a number. If the

CaHeK987 [17]

Answer:
BEGIN
INPUT N
IF N>0 AND N<10 THEN
OUTPUT "blue"
ELSE
IF N>10 AND N<20 THEN
OUTPUT "red"
ELSE
IF N>20 AND N<30 THEN
OUTPUT "green"
ELSE
OUTPUT "It is not a correct color option"
ENDIF
END.

Explanation:

3 0

2 years ago

Which answer would it be?

tigry1 [53]

<h2>My Answer:</h2>

FTP: The definition on Wikipedia is; "The File Transfer Protocol (FTP) is a standard network protocol used for the transfer of computer files between a client and server on a computer network."

So, if the question is asking for technology that provides a method for two computers hooked to the internet transfer files back and forth between each other, so if we can sum it up the answer which makes the most sense is <em>FTP</em>.

~TheExpertNerd

3 0

3 years ago

Assign decoded_tweet with user_tweet, replacing any occurrence of 'TTYL' with 'talk to you later'. Sample output with input: 'Go

nekit [7.7K]

Answer:

I am going to use the Python programming language to answer this. The source code is given below:

print("Enter your tweet here")

user_tweet = input()

decoded_tweet = user_tweet.replace('TTYL', 'talk to you later')

print("This is the decoded tweet: ")

print(decoded_tweet)

Explanation:

In the program the replace() module was used to replace 'TTYL' with 'talk to you later.'

Attached is the screenshot of the output.

8 0

3 years ago

Read 2 more answers

Write an application that displays appropriate prompts to the user and reads a person

vfiekz [6]

Answer:

The program to this question can be given as:

Program:

import java.util.*; //import package

public class Person_detail //define class

{

public static void main(String ar[]) //define main function

{

String Name,hobby,dream_Job; //declare variable.

int age;

Scanner sc = new Scanner(System.in); //creating Scanner class object for user input.

System.out.print("Enter Your Name : "); //message

name = sc.next(); //user input

System.out.print("Enter Your Age : ");

age = sc.nextInt();

System.out.print("Enter Your hobby: ");

hobby = sc.next();

System.out.print("Enter Your aim: ");

aim = sc.next();

//print values.

System.out.println("Hello, my name is "+name+" and I am "+age);

System.out.println("years old.My hobby is playing "+hobby+".");

System.out.println("I want to be a "+aim+" when I grow up!");

}

Output:

Hello, my name is XXX and I am 21

years old.My hobby is playing cricket .

I want to be a cricketer when I grow up!.

Explanation:

In the above program firstly we import the package for user input. Then we declare a class that is Person_detail. In this class, we declare the main function. In the main function, we declare a variable that is name, hobby, aim, and age. In these variable first 3 variables datatype is string and age variable data type in integer. Then we create a scanner class object and take input from the user and print it into a paragraph.

3 0

3 years ago