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AnnyKZ [126]
3 years ago
8

Find the product of 13 and -31​

Mathematics
2 answers:
maria [59]3 years ago
5 0

Answer:

-403

hope it helps.

have a good day

Elanso [62]3 years ago
3 0

Answer:

-403

Step-by-step explanation:

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A survey of a group of seventh graders and a group of teachers at a local middle school asked how many siblings they each have.
mihalych1998 [28]

Answer:

1.5

Step-by-step explanation:

Attached to this answer is the diagram of the box plot described in the question, and the means from the plot are calculated thus;

Students;    no. of siblings

student 0     2

student 1      4

student 2     7

student 3     5

student 4     2

Total             20

Mean no. of siblings = (total number of siblings) ÷ (total number of students)

Note that number of students here are the once that had at least one sibling, others without siblings are not used in the calculation, hence 5 students (student-0 to student-4) make up total number of students, while the remaining 4 students (student-4 to student-9) are disregarded.

Therefore, mean = 20 ÷ 5 = 4 siblings.

6 0
3 years ago
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Euglena are _______.<br><br> A heterotrophs<br><br> B autotrophs
Nataliya [291]

Answer:

they are both

if that is an option

7 0
3 years ago
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Rewrite 1/3 Barrel 2/3 hour as a unit rate
andreyandreev [35.5K]

Answer:

c is correct answer is yes

6 0
3 years ago
Explain how to perform a​ two-sample z-test for the difference between two population means using independent samples with known
iren2701 [21]

Answer:

The steps 1-7 have been explained

Step-by-step explanation:

The steps are;

1) We will verify that the population standard deviations are known and that the population is normally distributed which means the sample size must be a minimum of 30.

2) We will state the null and alternative hypothesis

3) We will determine the critical values from the relevant tables

4) From the critical values gotten, we will determine it's corresponding region where it can be rejected.

5)We will calculate the value of the test statistic from the formula;

z = [(x1' - x2') - (μ1 - μ2)]/√[((σ1)²/n1) + ((σ2)²/n2)]

6) If the value of the test statistic gotten from step 5 above falls in the region of rejection noted in step 4,then we will reject the null hypothesis

7) After rejection of the null hypothesis, we will now give a decision/conclusion on the claim.

5 0
3 years ago
1,000 darts were thrown at the rectangular board shown here. If 159 darts hit the circle, which of the following is most likely
Ludmilka [50]
The probability would be \frac{159}{1000},
Simplify and turn into ratio.
0.159 : 1.

I am unsure what the full question was though.

Hope this helps.

7 0
3 years ago
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