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3 years ago

Solve pls brainliest

Mathematics

2 answers:

Brums [2.3K]3 years ago

8 0

Answer:

the missing number is 18

Step-by-step explanation:

What would you do to 7 to get 21? multiply by 3. you would do the same to the 6.

zloy xaker [14]3 years ago

3 0

X = 18

Solving steps attached

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Which mathematical symbol would best fill in the blank to compare the two real numbers?√7_14/5

miss Akunina [59]

Answer:

√7 is less than 14/5

Step-by-step explanation:

√7 equals about 2.6

14/5 equals 2.8

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3 years ago

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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

-.27(x-2.9t)^2+2.56 in standard form? Please provide steps. Thank you!

kirill [66]

Answer:

$-\frac{27(-\frac{20t}{10}+x)^{n} }{50} +2.56$

Step-by-step explanation:

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2 years ago