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Mumz [18]
2 years ago
7

Need help on this! Please someone help!!!

Mathematics
1 answer:
Jet001 [13]2 years ago
7 0

This can be easily solved, especially with a calculator.
With the calculator, you can find that \sqrt{42} is about 6.4807.
Multiply that by 2, you get about 13 inches.

If you can't use a calculator, then you can just estimate. Since we know that \sqrt{36} is 6 and \sqrt{49} is 7, \sqrt{42} is in between them, so you can just say somewhere around 6.5.

Multiply 2 * 6.5 and you get 13 inches.

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From a random sample of 58 businesses, it is found that the mean time the owner spends on administrative issues each week is 21.
zzz [600]

Answer: (20.86, 22.52)

Step-by-step explanation:

Formula to find the confidence interval for population mean :-

\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}

, where \overline{x} = sample mean.

z*= critical z-value

n= sample size.

\sigma = Population standard deviation.

By considering the given question , we have

\overline{x}= 21.69

\sigma=3.23

n= 58

Using z-table, the critical z-value for 95% confidence = z* = 1.96

Then, 95% confidence interval for the amount of time spent on administrative issues will be :

21.69\pm (1.96)\dfrac{3.23}{\sqrt{58}}

=21.69\pm (1.96)\dfrac{1.7}{7.61577}

=21.69\pm (1.96)(0.223221)

\approx21.69\pm0.83

=(21.69-0.83,\ 21.69+0.83)=(20.86,\ 22.52)

Hence, the 95% confidence interval for the amount of time spent on administrative issues = (20.86, 22.52)

7 0
3 years ago
How do i cancel free trial
frez [133]

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5 0
3 years ago
Read 2 more answers
Indira is using a number line to add –1 + (–3). She begins by showing –1 on the number line, as shown below. What is the sum of
Naddik [55]
The answer is -4, because -1+-3=-4
5 0
3 years ago
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an architect is presenting a scale model of a building she's designed to the planning committee of college the scale of the mode
Naddik [55]

The tall of the actual building will be 216 feet

Step-by-step explanation:

An architect is presenting a scale model of a building she's designed

to the planning committee of college

1. The scale of the model is 1 inch = 18 feet

2. The tallest wall in the model is 12 inches

3. We need to know how tall the actual building will be

Let us used the ratio method

∵ The scale of the model is 1 inch represents 18 feet

∵ The tallest wall in the model is 12 inch

→  Model(in)    :    Actual(ft)

→  1                  :    18

→  12                :    h

- By using cross multiplication

∴ 1 × h = 12 × 18

∴ h = 216 feet

∴ The actual height is 216 feet

The tall of the actual building will be 216 feet

Learn more:

You can learn more about ratio in brainly.com/question/2707032

#LearnwithBrainly

7 0
3 years ago
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Someone please help me out with this question please
vova2212 [387]

Use Photomath , it will help all of your questions

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