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4 years ago

Find the mean of the data. A. 25 B. 27 C. 27.5 D.. 30

Mathematics

2 answers:

Verizon [17]4 years ago

7 0

What data? If it asked for mean of 25,27,27.5,30, the mean is (25+27+27.5+30)/4=27.375

Mekhanik [1.2K]4 years ago

5 0

The mean: ( 15 + 15 + 20 + 25 + 25 + 30 + 30 + 30 + 30 + 35 + 45 ) : 10 =
= 270 : 10 = 27
Answer: B ) 27

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A large random sample of American students in seventh grade showed that 20%20\% 20% 20, percent of them were reading below grade

WITCHER [35]

Answer:

The answer is A i must took the test

Step-by-step explanation:

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3 years ago

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5 men take 45hours to build a wall.how long will it take 9men working at the same wall?

Karolina [17]

Answer:

<u>25 hours</u>

Step-by-step explanation:

It takes 5 men 45 hours to build a wall.

So, if no. of men increases by 1.8 [∴ 5 x 1.8 = 9],

then time taken reduces by that same amount.

=> 45 hours / 1.8

=> 45 / (9/5)

=> 45 x 5 / 9

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3 years ago

Is a triangle with the given side lengths of 15cm, 17cm, and 19cm a right triangle?

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Lets see!
We need to use the pythagorean theorem (a^2+b^2=c^2) to check.
So..
15^2+ 17^2 = 19^2
225+ 289= 361
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3 years ago

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2. Find the common difference and the recursive formula. a. 22, 19, 16, 13, …

Musya8 [376]

Answer:

The common difference d is d = -3

The recursive formula is: $\mathbf{a_n=a_{n-1}-3}$

Step-by-step explanation:

We need to find the common difference and the recursive formula.

a. 22, 19, 16, 13, …

First we will find common difference

The formula of arithmetic sequence is: $a_n=a_1+(n-1)d$

where a_n is nth term, a_1 is 1st term and d is the difference

Looking at the sequence we get: a_1=22, a_2=19

Using these values we can find d, the common difference

$a_n=a_1+(n-1)d\\put\:n=2, a_2=19, a_1=22\\19=22+(2-1)d\\19=22+d\\d=19-22\\d=-3$

So, the common difference d is d = -3

Now, we will find the recursive formula:

The recursive formula is of type: $a_n=a_{n-1}+d$

We have found common difference d = -3

So, the recursive formula will be:

$a_n=a_{n-1}+d\\a_n=a_{n-1}+(-3)\\a_n=a_{n-1}-3$

The recursive formula is: $\mathbf{a_n=a_{n-1}-3}$

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3 years ago

4(a x b)=(4 x a)b is an example of which algebraic property

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4 years ago