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3 years ago

Math Help Please?

Mathematics

2 answers:

hjlf3 years ago

5 0

The median is 3 that's all I know

Lelechka [254]3 years ago

5 0

The Variance:

(12+6+8+5+2+7+3+5+6+7)/10=6.1 is mean (average)
Then you subtract 6.1 from each number in the data set and after getting the result you do the same thing as finding the average but you also have to square the result. So:
(5.9^2+(-0.1)^2+1.9^2+(-1.1)^2+(-4.1)^2+0.9^2+(-3.1)^2+(-1.1)^2+(-0.1)^2+0.9^2)/10= 6.89
Variance is 6.89.

<span>Standard Deviation is just the square root of Variance, so:
</span><span>√6.89=2.62 (the answer is rounded)</span>

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Need an answer fast!!!

trapecia [35]

Answer:

The length of the line segment is of 5.9 units.

Step-by-step explanation:

Distance between two points:

Suppose that we have two points, $(x_1,y_1)$ and $(x_2,y_2)$ . The distance between these two points is given by:

$D = \sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

How long is the line segment?

The distance between points P and Q. So

P(1,3), and Q(4,8).

$D = \sqrt{(4-1)^2+(8-3)^2} = \sqrt{3^2 + 5^2} = \sqrt{34} = 5.9$

The length of the line segment is of 5.9 units.

4 0

2 years ago

A circumference of the wheel of Victoria is 4.4m. How much distance coill it cover in 500 revolutions?

Semenov [28]

$\huge \bf༆ Answer ༄$

Total distance covered is equal to ~

Number of revolutions × circumference

$\sf500 \times 4.4$

$\sf2200 \: m$

Hence distance covered = 2200 m = 2.2 km

4 0

2 years ago

The reservoir dropped 6 feet during a long dry spell and then rose 4, feet following

vitfil [10]

Answer:

Its c

Step-by-step explanation:

6 0

3 years ago

A chemist has two acid solutions in stock: one is a 50% solution, and the other is a 80% solution. How much of each solution sho

arsen [322]

Easy way, visual

50---68---80%
Difference 18 12
Invert order to give ratio of 50% and 80%
Ratio 12 18 = 2:3

So by simple proportion:
volume of 50% needed = 100*2/(2+3)=40 mL
volume of 80% needed = 100*3/(2+3)=60 mL

Algebra way
Let x=volume of 50% needed.
Then
0.50*x+0.80*(100-x) = 0.68(100)
Expand and solve for x
0.5x+80-0.8x = 68
0.8x-0.5x = 80-68
0.3x = 12
x=12/0.3 = 40 mL (volume of 50%)
100-x=100-40=60 mL (volume of 80%)

8 0

3 years ago

G What is the solution to -3/7m<21 solving the inequality

Grace [21]

Answer:

so it's

3/7m<21

and we devide both sides of the inequality.

/2r-1\>7

And we can rewrite it as a compound Inequality

2r-1<7 (or) 2r-1>7 Ima give u the enter

[r<-3 or r>4 I guess it's like this❕

3 0

3 years ago