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Montano1993 [528]
3 years ago
7

to create an equivalent expression ray said he used commutative property on the following problem. 2x(3x5)=(2x3)x5 true or false

Mathematics
1 answer:
Nady [450]3 years ago
7 0

Answer : True

Let me know if I’m wrong

You might be interested in
What’s the Greatest common factor of 12 and 60?
rewona [7]

12 is your answer

12 x 1 = 12

12 x 5 = 60

hope this helps

3 0
3 years ago
Read 2 more answers
Consider the probability that no less than 96 out of 145 people will not get the flu this winter. Assume the probability that a
dsp73

Answer:

0.1324 = 13.24% probability that no less than 96 out of 145 people will not get the flu this winter.

Step-by-step explanation:

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

Can be approximated to a normal distribution, using the expected value and the standard deviation.

The expected value of the binomial distribution is:

E(X) = np

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

Normal probability distribution

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

When we are approximating a binomial distribution to a normal one, we have that \mu = E(X), \sigma = \sqrt{V(X)}.

In this problem, we have that:

n = 145, p = 0.61

So

\mu = E(X) = np = 145*0.61 = 88.45

\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{145*0.61*0.39} = 5.87

Consider the probability that no less than 96 out of 145 people will not get the flu this winter.

More than 95 people, which is the same as 1 subtracted by the pvalue of Z when X = 95. So

Z = \frac{X - \mu}{\sigma}

Z = \frac{95 - 88.45}{5.87}

Z = 1.115

Z = 1.115 has a pvalue of 0.8676

1 - 0.8676 = 0.1324

0.1324 = 13.24% probability that no less than 96 out of 145 people will not get the flu this winter.

6 0
2 years ago
HELP .!!! Plz (elementary question)
Goryan [66]
6/4 of a cup

also its 1 and 2/4 cups
4 0
3 years ago
Read 2 more answers
a. For a file whose size (in terms of number of bytes) is less than or equal to 12, then duplicate the contents of the file so t
pickupchik [31]

Answer:

#include <stdio.h>

int main()

{

int check;

char* dirname = "Subdir1";

check = mkdir(dirname,0766);

// check if directory is created or not

if (!check)

{

printf("Subdir1 Directory created\n");

 

char *dirname1="/Subdir1/D1";

if(mkdir("/Subdir1/D1", 0777)==-1)

{

printf("D1 Directory created\n");

int A1 = open ("/Subdir1/D1/A1.txt", 0666);

write(A1, "abcdefghij\n", strlen("abcdefghij\n"));

close(A1);

 

int A2 = open ("/Subdir1/D1/A2.txt", 0666);

write(A2, "you are beautiful\n", strlen("you are beautiful\n"));

close(A2);

 

int A3 = open ("/Subdir1/D1/A3.txt", 0666);

write(A3, "this is terrible!\n", strlen("this is terrible!\n"));

close(A3);

}

else

{

printf("Unable to create directory D1\n");

exit(1);

}

if(mkdir("/Subdir1/D2", 0777)==-1)

{

printf("D2 Directory created\n");

int B1 = open ("/Subdir1/D2/B1.ccc", 0664);

write(B1, "abcdefghij\n", strlen("abcdefghij\n"));

close(B1);

 

int B2 = open ("/Subdir1/D2/B2.ccc", 0664);

write(B2, "you are beautiful\n", strlen("you are beautiful\n"));

close(B2);

 

int B3 = open ("/Subdir1/D2/B3.ccc", 0664);

write(B3, "this is terrible!\n", strlen("this is terrible!\n"));

close(B3);

}

else

{

printf("Unable to create directory D2\n");

exit(1);

}

 

if(mkdir("/Subdir1/D3", 0777)==-1)

{

printf("D3 Directory created\n");

int C1 = open ("/Subdir1/D3/C1.txt", 0644);

write(C1, "abcdefghij\n", strlen("abcdefghij\n"));

close(C1);

 

int C2 = open ("/Subdir1/D3/C2.ddd", 0644);

write(C2, "you are beautiful\n", strlen("you are beautiful\n"));

close(C2);

 

int C3 = open ("/Subdir1/D3/C3.txt", 0644);

write(C3, "this is terrible!\n", strlen("this is terrible!\n"));

close(C3);

}

else

{

printf("Unable to create directory D2\n");

exit(1);

}

 

}

 

 

else {

printf("Unable to create directory Subdir1\n");

exit(1);

}

return 0;

}

Program 2:

#include <stdio.h>

 

long int findSize(char file_name[])

{

// opening the file in read mode

FILE* fp = fopen(file_name, "r");

 

// checking if the file exist or not

if (fp == NULL) {

printf("File Not Found!\n");

return -1;

}

 

fseek(fp, 0L, SEEK_END);

 

// calculating the size of the file

long int res = ftell(fp);

 

// closing the file

fclose(fp);

 

return res;

}

 

// Driver code

int main()

{

FILE *fptr1;

char c;

char file_name[] = {"D1.txt"};

long int res = findSize(file_name);

if (res != -1)

{

printf("Size of the file is %ld bytes \n", res);

if(res<=12)

{

fptr1 = fopen("D1.txt", "r");

c = fgetc(fptr1);

while (c != EOF)

{

fputc(c, fptr1);

c = fgetc(fptr1);

printf(c);

}

}

}

return 0;

}

4 0
3 years ago
I WILL GIVE BRAINLIEST TO WHOEVER IS CORRECT
irinina [24]

the third choice is correct


6 0
2 years ago
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