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2 years ago

Rafael needs to read 3 novels each month.

Mathematics

2 answers:

WINSTONCH [101]2 years ago

7 0

Answer:

n×m= number of books read

3×13= 39 books

Step-by-step explanation:

Using substitution for the original equation with m and n, you can find the number of books read by plugging in the numbers in place of the variables.

Lerok [7]2 years ago

6 0

I think 3x13=39 books read

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A sample of 5 buttons is randomly selected and the following diameters are measured in inches. Give a point estimate for the pop

Helen [10]

Answer:

$s^2 = \frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}$

But we need to calculate the mean with the following formula:

$\bar X = \frac{\sum_{i=1}^n X_I}{n}$

And replacing we got:

$\bar X = \frac{ 1.04+1.00+1.13+1.08+1.11}{5}= 1.072$

And for the sample variance we have:

$s^2 = \frac{(1.04-1.072)^2 +(1.00-1.072)^2 +(1.13-1.072)^2 +(1.08-1.072)^2 +(1.11-1.072)^2}{5-1}= 0.00277\ approx 0.003$

And thi is the best estimator for the population variance since is an unbiased estimator od the population variance $\sigma^2$

$E(s^2) = \sigma^2$

Step-by-step explanation:

For this case we have the following data:

1.04,1.00,1.13,1.08,1.11

And in order to estimate the population variance we can use the sample variance formula:

$s^2 = \frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}$

But we need to calculate the mean with the following formula:

$\bar X = \frac{\sum_{i=1}^n X_I}{n}$

And replacing we got:

$\bar X = \frac{ 1.04+1.00+1.13+1.08+1.11}{5}= 1.072$

And for the sample variance we have:

$s^2 = \frac{(1.04-1.072)^2 +(1.00-1.072)^2 +(1.13-1.072)^2 +(1.08-1.072)^2 +(1.11-1.072)^2}{5-1}= 0.00277\ approx 0.003$

And thi is the best estimator for the population variance since is an unbiased estimator od the population variance $\sigma^2$

$E(s^2) = \sigma^2$

3 0

3 years ago

:) help yuh yuh PLS HELP

pishuonlain [190]

Answer:

first box= $\sqrt{75}$ second box= $\sqrt{73}$

Step-by-step explanation:

The square root of 74 is roughly between the suareoots of 75 and 73.

Have a fantastic-o day friends! Have a great life and don't waste time doing nothing.

7 0

3 years ago

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What is (4x + 3) + (-2x + 4)

kobusy [5.1K]

Answer:

(4x + 3) + (-2x + 4) = 2x + 7

Step-by-step explanation:

(4x + 3) + (-2x + 4) = you then collect like terms

(4x + -2x) + (3 + 4)= like this, and you add what's inside perenthesis

= 2x + (3 + 4). step-by-step

= 2x + 7. then that is how you get =2x+7

5 0

3 years ago

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Cathy has 16 meters of fencing to make a rectangular pen for some rabbits what dimensions will give the maximum area?

Travka [436]

The max occurs when length=width

so
perimiter=16
and L=W
P=2(L+W)
16=2(L+L)
16=2(2L)
16=4L
4=L

the dimentions are length and width are 4 meters
aera will be 16 square meters

6 0

3 years ago

SOLVE WITH AN EXPLANATION PLS

Softa [21]

Answer:

Option C
Option B

Step-by-step explanation:

<u>Let's simplify this further to get our answer.</u>

-5/6(12 - 6x + 18y)
=> -60/6 + 30x/6 - 90y/6
=> -10 + 5x - 15y

Looking at the options, we can say that Option C and B are correct.

5 0

2 years ago

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