Each cement block weighs 5.2 kilograms. How much do 8 blocks weigh in total?

How do you solve this 8*[[(7+4)*2]-[(11-7)*4]]? I am trying to help my son with his homework and sad to say I am 46 and I can't

elena55 [62]

Answer: 160

Step-by-step explanation:

Don't know how to

7 0

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

5 0

2 years ago

Mrs jawlik baked 2 pans of brownies.Draw the pans and estimate to partition each pan into 8 equal pieces

Lena [83]

All you have to do is draw two circles then make lines in the circles so that you have 8 pieces, do that twice.

5 0

3 years ago

Find the volume of the sphere shown. Give each answer rounded to the nearest cubic unit.

Naily [24]

Answer: 1436 units cubed (3.14) or 1437 units cubed (π)

Step-by-step explanation:

answer depends on if you substitute in 3.14 for π or not

8 0

3 years ago

Find the percent of discount. Round to the nearest whole percent.

Margarita [4]

Answer:

Step-by-step explanation:

105.5x100/120=87.91so 100-88 = 22%

4 0

3 years ago