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SpyIntel [72]
3 years ago
8

You estimate that a jar contains 68 marbles. The actual number of marbles is 60. Find the percent error. Round your answer to th

e nearest tenth.
Mathematics
1 answer:
seraphim [82]3 years ago
5 0
60 is already rounded to the nearest tenth.
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PLZ HELP ME FIGURE THIS OUT
Romashka [77]

Answer:

f=2

Step-by-step explanation:

3=9-3f

3-9=-3f

-6=-3f

2=f

f=2

5 0
3 years ago
Mrs. Alberts has taught seventh grade math for thirty years. Every year she calculates and records the class average on the fina
sdas [7]

Answer:

2

Step-by-step explanation:

89.633333333333

Mean Absolute Deviation (MAD): 2.0755555555556

rounding these both you get 90 and 2.

5 0
3 years ago
Find the area of the right triangle. ​
frez [133]

Answer:

12

Step-by-step explanation:

Length=4

Width=6

Triangle area formula: Length*Width/2

So, 6*4/2

Equal to 6*2

Answer: 12

4 0
2 years ago
What are two different ways of factoring -3x - 9? Select all that apply.
sergiy2304 [10]

Answer:

The correct answer is A and C.

5 0
2 years ago
Read 2 more answers
In a survey of adults aged 57 through 85​ years, it was found that 86.6​% of them used at least one prescription medication. Com
OleMash [197]

Answer:

a) 272 used at least one prescription​ medication.

b) The 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication is (85.6%, 87.6%).

Step-by-step explanation:

Question a:

86.6% out of 3149, so:

0.866*3149 = 2727.

272 used at least one prescription​ medication.

Question b:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the z-score that has a p-value of 1 - \frac{\alpha}{2}.

For this problem, we have that:

n = 3149, \pi = 0.866

90% confidence level

So \alpha = 0.1, z is the value of Z that has a p-value of 1 - \frac{0.1}{2} = 0.95, so Z = 1.645.  

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.866 - 1.645\sqrt{\frac{0.866*0.134}{3149}} = 0.856

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.866 + 1.645\sqrt{\frac{0.866*0.134}{3149}} = 0.876

For the percentage:

0.856*100% = 85.6%

0.876*100% = 87.6%.

The 90% confidence interval estimate of the percentage of adults aged 57 through 85 years who use at least one prescription medication is (85.6%, 87.6%).

7 0
3 years ago
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