MATHEMATICS MIDDLE SCHOOL

Complete the chart to find the mean,variance,and standard deviation. 45 340 400 825

Answers

Answer 1
Answer:

Answer:

A. Mean =  402.5

B. Variance = 77,556.25

C. Standard Deviation =  278.49

Step-by-step explanation:

Let's calculate the mean, variance and standard deviation of the set of numbers given:

A. Mean = (45 + 340 + 400 + 825)/4 = 1,610/4 = 402.5

B. Variance [(45 - 402.5)² + (340 - 402.5)² + (400 - 402.5)² + (825 - 402.5)²]/4 =  [(127,806.25 + 3,906.25 +6.25 + 178,506.25/4 =77,556.25

C. Standard Deviation = √Variance = √77,556.25 = 278.49
Answer 2
Answer:

Answer:

1. 45⠀= -357.5⠀= 127,806.3⠀mean = 402.5

2. 340⠀= -62.5⠀ = 3,906.3⠀variance = 77,556.3

3. 400⠀= -2.5⠀= 6.3⠀deviation = 278.5

4. 825⠀= 422.5⠀= 178, 506⠀n = 4

Σ X = 1,610⠀X = 402.5⠀Σ (X - X)2 = 310,225.2

Step-by-step explanation:

:)

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Answers

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82 children had to learn the one line of fun song. The fun song has 47 lines. How many lines did they learn altogether

Answers

Answer:

3,854

Step-by-step explanation:

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Olivia has 1 1/5 yards of fabric. she uses 5/8 of the fabric to make a shirt. How much fabric did she use?

Answers

what you do is add 11/5 and 5/8 so you will line those up and find out the common denominator which is 40 cause 5×8 is 40 so you put 40 for your denominator. next you figure out the numerator which will be 88 and 25 now since were adding your gonna take that 88 + 25 and you get 113/40 now you do 40÷113 and you get 17 and 33/40.
hope this helped
Make 1 1/5 into improper fraction which is 6/5 and then find the common denominator 6/5 and 5/8.
Common denominator is 40. Multiply 8 by 6 and 8 by 5 so it would become 48/40. Do the same with 5/8 except multiply by 5 which would be 25/40. Subtract 48/40 and 25/40 which is.....

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Chetan and his 5 siblings buy a present for their mother on Mother's Day. As the eldest brother, he pays 0.2 of the cost of the present. The rest of the siblings share the balance equally. Each sibling pays $9.50 less than Chetan. What is the cost of the present.

Answers

Let's say that X is what the other 5 siblings pay. X + $9.50 is what Chetan pays. X + $9.50 is 1/5 of the cost of the present. To solve this we have to do 0.8 divided by 5 (the remaining cost split between 5 people) which is 0.16. Now from this we can learn that $9.50 is 0.04 of the cost of the present. A simple way to solve this is do 1.00 divided by 0.04 and then multiply $9.50 by that amount. 1.00 divided by 0.04 is 25 so $9.50 times 25 is $237.5.
The present costs $237.5 
As I read over this I may not be correct, however this is how I solved it as an advanced mathematics grade 8 student.

What is the answer to this algebra 1 answer : 6> 4-2×<4

Answers

6>4-2x<4

so therefor (4x-2) must be less than 6 and less than 4
it must be
6>4-2x and 4<4-2x
find the intersection

6>4-2x
add 2x to both sides
6+2x>4
subtract 6
2x>-2
divide by 2
x>-1



4>4-2x
add 2x
4+2x>4
subtract 4
2x>0
x>0




so we have
x>0
and x>-1
the range of x>-1 includes most of x>0 so the answer is
x>-1

I need help with question 3 a,b,c,d pleaseeee pleaseee

Answers

Hope this helps some
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