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3 years ago

The combination of a lock uses numbers 1-10

Mathematics

1 answer:

SVETLANKA909090 [29]3 years ago

5 0

Answer:If the digit of 0 is allowed, then:

1/(10*9*8)= 1/720

If it is not permitted, then:

1/(9*8*7)= 1/504

I hope this helps you!

Step-by-step explanation:

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g A random sample of 100 students was taken. Eighty-five of the student in the sample experienced anxiety during the exam. We ar

BaLLatris [955]

Answer:

The test statistic is $z = 1.25$

Step-by-step explanation:

We are interested in determining whether or not the proportion of the student who experience anxiety during the exam is significantly more than 80%.

At the null hypothesis, we test if the proportion is 80%, that is:

$H_0: p = 0.8$

At the alternate hypothesis, we test if the proportion is more than 80%, that is:

$H_a: p > 0.8$

The test statistic is:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

80% is tested at the null hypothesis:

This means that $\mu = 0.8, \sigma = \sqrt{0.2*0.8} = 0.4$

A random sample of 100 students was taken. Eighty-five of the student in the sample experienced anxiety during the exam.

This means that $n = 100, X = \frac{85}{100} = 0.85$

The test statistic is

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{0.85 - 0.8}{\frac{0.4}{\sqrt{10}}}$

$z = 1.25$

The test statistic is $z = 1.25$

4 0

3 years ago

What makes the square root of 8 irrational?

Dvinal [7]

You can't write it as a fraction.

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4 years ago

What is the measure of

irga5000 [103]

I would say the answer is A. 65

Since angel A is 35 degrees, and angle c is a right angle which is 90 degrees, I would probably say that angle B is 65 degrees.

Hope this helped! :D

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3 years ago

Anybody can help me with this ?

Pavlova-9 [17]

Answer:

Step-by-step explanation:

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y=3(3)+1

y=9+1

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Solnce55 [7]

Answer:

it is c

Step-by-step explanation:

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3 years ago