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umka21 [38]
3 years ago
6

A student got 22 out of 25 questions correctly, shade the model to help write the decimal that repersents the fraction of correc

t answers?
Mathematics
1 answer:
IrinaK [193]3 years ago
5 0

Answer:

25  =  23

100 =  X

Cross multiply and you will have:

25x = 2300

Step-by-step explanation:


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A sample of students from an introductory psychology class were polled regarding the number of hours they spent studying for the
Anni [7]

Answer:

8.68,13.16

Step-by-step explanation:

Hint- First we have to calculate the mean and standard deviation of the sample and then applying formula for confidence interval we can get the values.

Mean of the sample is,

\mu=\dfrac{\sum _{i=1}^{24}a_i}{24}=\dfrac{262}{24}=10.92

Standard deviation of the sample is,

\sigma =\sqrt{\dfrac{\sum _{i=1}^{24}\left(x_i-10.92\right)^2}{24-1}}=5.6

The confidence interval will be,

=\mu \pm Z\dfrac{\sigma}{\sqrt{n}}

Here,

Z for 95% confidence interval is 1.96, and n is sample size which is 24.

Putting the values,

=10.92 \pm 1.96\cdot \dfrac{5.6}{\sqrt{24}}

=10.92 \pm 2.24

=8.68,13.16

Confidence interval is used to express the degree of uncertainty associated with a sample.

95% confidence interval means that if we used the same sampling method to select different samples and calculate an interval, we would expect the true population parameter to fall within the interval for 95% of the time.

5 0
3 years ago
2x-3y=8 . How do I solve this ?
shepuryov [24]
X equal what umber,and y equal what number?
8 0
3 years ago
Read 2 more answers
The output is seven more than the input
charle [14.2K]
Y = x - 7

or 

f(x) = x - 7
3 0
3 years ago
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695 -7x = 140<br> What is the value of x?
Sphinxa [80]

Hello!

695 - 7x = 140

-7x = 140 - 695

-7x = -555

-x = -79.29

x = 79.29

I hope this helps you! Have a lovely day!

- Mal

5 0
3 years ago
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The trapezoid.

Step-by-step explanation:

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3 years ago
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