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3 years ago

I WILL GIVE BRAINLIEST PLEASE ANSWER ASAP

Mathematics

2 answers:

kupik [55]3 years ago

7 0

I think its A or C. Not sure tho

Anna35 [415]3 years ago

3 0

Answer:

Step-by-step explanation:

It’s c

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A random sample of 650 people found that 312 preferred to read using an electronic device rather than reading printed material.

nirvana33 [79]

Answer:

Step-by-step explanation:

the answer is 48 because according to the results 48% of people prefered given device and 48% of 100 is 48

5 0

3 years ago

Read 2 more answers

Absolute value of |x|-2=5

Stells [14]

Answer:

x = ± 7

|-7|-2=5

|7|-2=5

± means positive or negative

Step-by-step explanation:

|x|-2=5

Get x by itself by adding 2 to both sides.

x - 2 + 2= 5 + 2

-2 + 2 cancels out

x = 5 + 2

x = 7

Absolute value is how far a number is from 0.

x can be either positive or negative.

7 0

3 years ago

Find the volume of the right cone. Shown as a decimal rounded to the nearest tenth 26 and 18

marysya [2.9K]

Answer:

caculate the area of a rectangle of length with 250cm and width with 200cm

5 0

3 years ago

In the figure, PR = 15x – 11 and PQ = 3x + 6. Find QR in terms of x.

Kryger [21]

Answer: 12x - 17

Step-by-step explanation:

To find QR subtract PQ from PR

15x-11 -(3x+6) ---> 15x - 11 - 3x -6 = 12x -17

6 0

3 years ago

A researcher estimates the 90% CI for a sample with a mean of M = 8.9 and a standard error (sigma_M) of 2.1. What is the confide

Shalnov [3]

Answer:

The confidence interval at this level of confidence is between 5.4455 and 12.3545.

Step-by-step explanation:

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 $z = 1.645$

Now, find M as such

$M = z*s$

In which s is the standard deviation of the sample, which is also called standard error. So

$M = 1.645*2.1 = 3.4545$

The lower end of the interval is the sample mean subtracted by M. So it is 8.9 - 3.4545 = 5.4455

The upper end of the interval is the sample mean added to M. So it is 8.9 + 3.4545 = 12.3545

The confidence interval at this level of confidence is between 5.4455 and 12.3545.

4 0

4 years ago