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guapka [62]
1 year ago
12

Find the area of this semi-circle with radius, r = 75cm.Give your answer rounded to 1 DP.

Mathematics
1 answer:
lawyer [7]1 year ago
7 0

The area of this semi-circle with radius is 8831.3 square cm

<h3>How to find the area of this semi-circle with radius?</h3>

The radius is given as:

Radius, r = 75cm.

The area of this semi-circle with radius is calculated as:

A = 0.5 * πr^2

Substitute the known values in the above equation

A = 0.5 * 3.14 * 75^2

Evaluate

A = 8831.3

Hence, the area of this semi-circle with radius is 8831.3 square cm

Read more about area at:

brainly.com/question/22972014

#SPJ1

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Answer:

B

Step-by-step explanation:

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Evaluate how organizations can use one-sample hypothesis testing to determine if there are performance issues in the organizatio
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Answer:

Organizations can use one-sample hypothesis test to determine if there are performance issues in many ways.

It can be applied to the performance of a sector, a machine, a product, an advertising campaing, etc.

For example, we can take the example of a machine. It may be claimed that a specific machine performs significantly worse than the average.

This average would be the population mean: the average performance of the machines of the same type or process.

Then, a sample of the performance of the machine in study is taken and the hypothesis test can be performed to test the claim that this machine performs significantly worse.

Step-by-step explanation:

For example, we have an historic performance for this type of machine of 100 units a day. The machine A in study is sampled 14 days and have a performance of 92 units a day, with a sample standard deviation of 12 units/day. We have to test the claim that the machine A makes less units per day than the average.

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H_0: \mu=100\\\\H_a:\mu< 100

The significance level is 0.05.

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The sample mean is M=92.

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The estimated standard error of the mean is computed using the formula:

s_M=\dfrac{s}{\sqrt{n}}=\dfrac{12}{\sqrt{14}}=3.2071

Then, we can calculate the t-statistic as:

t=\dfrac{M-\mu}{s/\sqrt{n}}=\dfrac{92-100}{3.2071}=\dfrac{-8}{3.2071}=-2.4944

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df=n-1=14-1=13

This test is a left-tailed test, with 13 degrees of freedom and t=-2.4944, so the P-value for this test is calculated as (using a t-table):

P-value=P(t

As the P-value (0.0134) is smaller than the significance level (0.05), the effect is  significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that machine A produces significantly less units per day than the average.

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3 years ago
The scale of a map uses 10 cm for 30 km.<br> How many centimeters does it use for 9 km?<br> +
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Step-by-step explanation:

30 divided by 10 is 3.

9 divided by 3 is 3.

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Answer:

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