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3 years ago

B) The price the store pays for HD headphones if it spends a total of $2,000 on headphones and

2 answers:

4 0

Answer: $900
Explanation:
I assume you’re asking for how much the store pays for HD headphones.
Given:
$2000 total for all headphones
55 basic headphones for $20 each

Total amount for BASIC headphones:
=> 55 x $20
=> $1100

Amount for HD headphones:
=> total amount of headphones - amount for BASIC headphones
=> $2000 - $1100
= $900

Simora [160]3 years ago

3 0

Answer: where’s the question at?

Step-by-step explanation:reword it so i can understand and i’ll try to help

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392 millimeters I think that's the answer but I'm not sure

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Please solve the following Factor. 9w2-49

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Step-by-step explanation:

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3 years ago

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3 years ago

Suppose that a recent article stated that the mean time spent in jail by a first-time convicted burglar is 2.5 years. A study wa

4vir4ik [10]

Using the z-distribution, it is found that since the test statistic is greater than the critical value, it can be concluded that the mean length of jail time has increased.

At the null hypothesis, it is tested if the mean length of jail time is still of 2.5 years, that is:

$H_0: \mu = 2.5$

At the alternative hypothesis, it is tested if it has increased, that is:

$H_1: \mu > 2.5$

We have the standard deviation for the population, thus, the z-distribution is used. The test statistic is given by:

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

The parameters are:

$\overline{x}$ is the sample mean.
$\mu$ is the value tested at the null hypothesis.
$\sigma$ is the standard deviation of the sample.
n is the sample size.

For this problem, the values of the parameters are: $\overline{x} = 3, \mu = 2.5, \sigma = 1.5, n = 26$

Hence, the value of the test statistic is:

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

$z = \frac{3 - 2.5}{\frac{1.5}{\sqrt{26}}}$

$z = 1.7$

The critical value for a right-tailed test, as we are testing if the mean is greater than a value, with a significance level of 0.05, is of $z^{\ast} = 1.645$

Since the test statistic is greater than the critical value, it can be concluded that the mean length of jail time has increased.

A similar problem is given at brainly.com/question/24166849

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2 years ago