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4 years ago

At a school there are 864 students and 80 staff members. 5/8 of the students are boys. How many girls are in the school?

Mathematics

2 answers:

alexgriva [62]4 years ago

7 0

Answer:

354

Step-by-step explanation:

3/8 multiplied by 864

Phoenix [80]4 years ago

3 0

Answer: 324 girls

864 divided by 8 = 108

108 x 5 = 540

864 - 540 = 324

Step-by-step explanation:

80 staff members is irrelevant.

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The standard deviation of a sample taken from population A is 17.6 for a sample of 25.

lawyer [7]

Answer:

The standard deviation of the sample mean differences is _5.23_

Step-by-step explanation:

We have a sample of a population A and a sample of a population B.

For the sample of population A, the standard deviation $\sigma_A$ is

$\sigma_A = 17.6$

The sample size $n_A$ is:

$n_A = 25$ .

For the sample of population B, the standard deviation $\sigma_B$ is

$\sigma_B = 21.2$

The sample size $n_B$ is:

$n_B = 30$ .

Then the standard deviation for the difference of means has the following form:

$\sigma=\sqrt{\frac{\sigma_A^2}{n_A}+\frac{\sigma_B^2}{n_B}}$

Finally

$\sigma=\sqrt{\frac{17.6^2}{25}+\frac{21.2^2}{30}}\\\\\sigma= 5.23$

7 0

4 years ago

Find the equation for the inverse relation of y = x2 +7.

Rainbow [258]

Answer:

Step by step explanation:

5 0

4 years ago

Help me on this!! Asap!!

Anna11 [10]

Answer:

D. Fundamental Principle of Counting
D. 32
B. 12 ways
D. 24
B. 18

Step-by-step explanation:

Q1

The Fundamental Principle of Counting states that we can find the total number of ways that two or more separate tasks can happen by multiplying the number of ways each task can happen separately.

Q2

No. of ways = 2⁵ = 32

Q3

No. of ways = 4 x 3 = 12 ways

Q4

⁴P₃ = 4! / 1! = 4 x 3 x 2 = 24

Q5

No. of ways = 2 x 3 x 3 = 18

4 0

2 years ago

Asha and Jamal are selling plants to raise money for their soccer team. They started out with 45 plants. They sold some plants a

mel-nik [20]

Asha : 45 - p = 21......this is correct

Jamal : 21 + p = 45....this is also correct

both equations will find the correct solution <==

45 - p = 21 21 + p = 45
-p = 21 - 45 p = 45 - 21
-p = - 24 p = 24
p = 24

3 0

4 years ago

How do you write 75/11 as a continued fraction?

alex41 [277]

Answer:

6.818181...

Step-by-step explanation:

3 0

3 years ago