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3 years ago

Use the empirical rule to find a reasonable estimate for P(z ≤ 0.82).

Mathematics

2 answers:

prisoha [69]3 years ago

8 0

The next answer is 79%

edge2020

kifflom [539]3 years ago

7 0

The answer is 80%..................

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A chemist examines 12 sedimentary samples for bromide concentraction. The mean bromide concentration for the sample date is 0.43

Umnica [9.8K]

Answer:

a) $z = 1.645$

b) Lower endpoint: 0.422cc/m³

Upper endpoint: 0.452 cc/m³

Step-by-step explanation:

Population is approximately normal, so we can find the normal confidence interval.

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.9}{2} = 0.05$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.05 = 0.95$ , so $z = 1.645$ . This is the critical value, the answer for a).

Now, find M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.645*\frac{0.0325}{\sqrt{12}} = 0.015$

The lower end of the interval is the sample mean subtracted by M. So it is 0.437 - 0.015 = 0.422cc/m³.

The upper end of the interval is the sample mean added to M. So it is 0.437 + 0.015 = 0.452 cc/m³.

Lower endpoint: 0.422cc/m³

Upper endpoint: 0.452 cc/m³

4 0

3 years ago

Rewrite 5a-(a-3b) in standard form

slamgirl [31]

So, -(a-3b) becomes -1(a-3b). Then, this becomes 5a-1a+3b. There is +3b because there is a double negative. So, 5-1=4, so your answer is 4a+3b. Pls brainliest

3 0

3 years ago

What does 7 7/12+(3 1/2+1 7/8)=

Cloud [144]

The answer would be 12 1/8

3 0

2 years ago

Read 2 more answers

Una caja de fideos de 7.2 onzas a 0.67 o una caja de fideos de 13 onzas a 1.28 cual tiene el mejor precio

uysha [10]

Answer:

The first one. Brainly is also in spanish

4 0

3 years ago

Brenna is

soldi70 [24.7K]

Write a C program to compute Matrix Multiplication of two matrices. Use one dimensional array to store each matrix, where each row is stored after another. Hence, the size of the array will be a product of number of rows times number of columns of that matrix. Get number of row and column from user and use variable length array to initialize the size of the two matrices as well as the resultant matrix. Check whether the two matrices can be multiplied or not. Write a getMatrix() function to generate the array elements randomly. Write a printMatrix() function to print the 1D array elements in 2D Matrix format. Also, write another function product(), which multiplies the two matrices and stores in the resultant matrix. With SEED 5, the following output is generated.

Sample Output

Enter the rows and columns of Matrix A with space in between: 3 5

Enter the rows and columns of Matrix B with space in between: 5 4

Matrix A:

8 6 4 1 6

2 9 7 7 5

1 3 1 1 2

Matrix B:

9 5 4 5

9 9 8 1

4 4 3 5

2 6 2 1

4 5 2 4

Product AxB:

168 146 106 91

161 186 125 81

50 52 37 22

In conclusion, the answer is 5x1

Please give Brainliest answer thanks! :)

6 0

3 years ago

Read 2 more answers