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mr_godi [17]
3 years ago
13

Can you help me please!!!!

Mathematics
2 answers:
pentagon [3]3 years ago
5 0
If you add the 3/4s with the 2 1/4 hour breaks it would be 1 hour and 1 fourth.
Then you take 10-1/2 hours and subtract it by 1 hour and 1 fourth.
So you would get 9-1/4 hours
snow_lady [41]3 years ago
3 0
You would get 9-1/4 hours
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There were 324 adults surveyed. Among the participants, the mean number of hours of sleep each night was 7. 5 and the standard d
NeTakaya

The margin of error for 324 adults surveyed with 1.6 standard deviations is 0.1742.

<h3>What is the margin of error?</h3>

The margin of error can be defined as the amount of random sampling error in the results of a survey. It is given by the formula,

\text{MOE}_{\gamma}=z_{\gamma} \times \sqrt{\frac{\sigma^{2}}{n}}

\text{MOE} = margin of error

\gamma = confidence level

z_{\gamma} = quantile

σ = standard deviation

n = sample size

As it is given that the sample size of the survey is 324, while the standard deviation of the survey is 1.6.

We know that the value of the z for 95% confidence interval is 1.96. Therefore, using the formula of the standard of error we can write it as,

\text{MOE}_{\gamma}=z_{\gamma} \times \sqrt{\dfrac{\sigma^{2}}{n}}\\\\\text{MOE}_{\gamma}=1.96 \times \sqrt{\dfrac{1.6^{2}}{324}}\\\\\text{MOE}_{\gamma}=0.1742

Hence, the margin of error for 324 adults surveyed with 1.6 standard deviations is 0.1742.

Learn more about Margin of Error:

brainly.com/question/6979326

5 0
3 years ago
The sum of 2 time a number and -7, added to 5 times the number
DIA [1.3K]

Answer:

7x - 7

Step-by-step explanation:

Variable: X = the unknown number

2x + (-7) + 5x

= 7x - 7

4 0
4 years ago
An item prices $80 is on sale for 20% off there is a 3% sales tax what is the amount before taxes
Eduardwww [97]

Answer:$64 BEFORE TAX

Step-by-step explanation: Pretax price:$62.14

Sales tax:$1.86

Total price with sales tax:$64.00

3 0
3 years ago
Read 2 more answers
Which pair of triangles can be proven congruent by SAS?
LuckyWell [14K]

Answer:2nd one starting from top left

Step-by-step explanation:

there r two sides congruent and an angle in between

8 0
3 years ago
HELP ASAP WILL GIVE BRAINLY
Mila [183]

Answer:

1 and 2 are not polyhedrons, as a circle has infinite sides

1. cone, 1 vertex

2. sphere, nothing

3. pentagonal prism?

wait but can't every face be a base???

anyway 7 faces, 10 vertices

4. triangular prism

5 faces, 6 vertices

Step-by-step explanation:

8 0
3 years ago
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