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Korvikt [17]
3 years ago
5

Assume X and Y are indepndent. Assume that X has mean 10 and standard deviation 8. Assume Y has mean 12 and standard deviation 6

. What is the standard deviation of the variable Z = X + Y. a. 8 b. 6 c. 10 d. 12
Computers and Technology
1 answer:
Vitek1552 [10]3 years ago
6 0

Answer:

\sigma_z = 10

Explanation:

Given

\bar x = 10

\sigma_x = 8

\bar y = 12

\sigma_y = 6

z = x + y

Required

\sigma_z

This is calculated as:

\sigma_z = \sqrt{Var(x) + Var(y)}

Calculate Var(x)

We have:

Var(x) = \sigma_x^2

Var(x) = 8^2

Var(x) = 64

Calculate Var(y)

We have:

Var(y) = \sigma_y^2

Var(y) = 6^2

Var(y) = 36

So, we have:

\sigma_z = \sqrt{Var(x) + Var(y)}

\sigma_z = \sqrt{64 + 36}

\sigma_z = \sqrt{100}

\sigma_z = 10

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4.5 Code Practice
Alex787 [66]

Answer:

The answer to this question is given below in the explanation section.

Explanation:

This program is written in C++.

                                                                         

#include <iostream>

using namespace std;

int main()

{

   

   string word;// variable for taking user input

   int cond;// to set condition true if user preses the stop and exit from loop

   

   cout<<"Enter word: \n";

   cin>>word;

   do// start while loop

   {

       

       

       if(word=="stop" || word =="STOP" || word == "Stop")// if user enter word stop, then program exit

       {

       cond=0;

       

       }

       else//otherwise loop continue

       {

           cout<<" You Entered "+ word +"\n";

           cout<<"Enter word: \n";

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           cond=1;

       }

   }  

   while(cond == 1);// if user don't enter word "stop" loop run continuesly.  

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}

5 0
3 years ago
1. Assume that word is a variable of type String that has been assigned a value . Assume furthermore that this value always cont
s2008m [1.1K]

Answer:

1.word = "George slew the dragon"

startIndex = word.find('dr')

endIndex = startIndex + 4

drWord = word[startIndex:endIndex]

2. sentence = "Broccoli is delicious."

sentence_list = sentence.split(" ")

firstWord = sentence_list[0]

Explanation:

The above snippet is written in Python 3.

1. word is initialized to a sentence.

Then we find the the occurence of 'dr' in the sentence which is assign to startIndex

We then add 4 to the startIndex and assign it to endIndex. 4 is added because we need a length of 4

We then use string slicing method to create a substring from the startIndex to endIndex which is assigned to drWord.

2. A string is assigned to sentence. Then we split the sentence using sentence.split(" "). We split based on the spacing. The inbuilt function of split returns a list. The first element in the list is assigned to firstWord. List uses zero based index counting. So. firstWord = sentence_list[0] is use to get first element.

4 0
4 years ago
Which of the following is not the name of a java wrapper class from the Java API?
11111nata11111 [884]

Answer:

Int

byte

Explanation:

In java there are eight primitive data types has a class dedicated, and then we can find eight wrapper classes, I'm going to let you the next table with the 8 example:

Assume the next table byte and Int are primitive data, the different with byte is only the capital letter Byte.

Primitive Wrapper Class

boolean         Boolean  

byte                 Byte  

char                 Character

int                 Integer  

float                 Float  

double         Double

long                 Long  

short         Short

3 0
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ollegr [7]

Answer:

1) Standalone machine

2) Local

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Done your first 3

6 0
3 years ago
Help a fellow coder and anser these 5 questions
BlackZzzverrR [31]

Answer: yes because it helps

Explanation: it shows everything

4 0
3 years ago
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