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Furkat [3]
2 years ago
9

I need help please ​

Mathematics
1 answer:
Triss [41]2 years ago
8 0
She paid $3.28 per gallon.

24.60 divided by 7.5 equals 3.28.
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The city of Madison regularly checks the quality of water at swimming beaches located on area lakes. Fifteen times the concentra
Maksim231197 [3]

Answer:

The sample standard deviation is 393.99

Step-by-step explanation:

The standard deviation of a sample can be calculated using the following formula:

s=\sqrt[ ]{\frac{1}{N-1} \sum_{i=1}^{N}(x_{i}-{\displaystyle \textstyle {\bar {x}}}) ^{2} }

Where:

s= Sample standart deviation

N= Number of observations in the sample

{\displaystyle \textstyle {\bar {x}}}= Mean value of the sample

and \sum_{i=1}^{N}(x_{i}-{\displaystyle \textstyle {\bar {x}}}) ^{2} } simbolizes the addition of the square of the difference between each observation and the mean value of the sample.

Let's start calculating the mean value:

\bar {x}=\frac{1}{N}  \sum_{i=1}^{N}x_{i}

\bar {x}=\frac{1}{15}*(180+1600+90+140+50+260+400+90+380+110+10+60+20+340+80)

\bar {x}=\frac{1}{15}*(3810)

\bar {x}=254

Now, let's calculate the summation:

\sum_{i=1}^{N}(x_{i}-\bar {x}) ^{2} }=(180-254)^2+(1600-254)^2+(90-254)^2+...+(80-254)^2

\sum_{i=1}^{N}(x_{i}-\bar {x}) ^{2} }=2173160

So, now we can calculate the standart deviation:

s=\sqrt[ ]{\frac{1}{N-1} \sum_{i=1}^{N}(x_{i}-{\displaystyle \textstyle {\bar {x}}}) ^{2} }

s=\sqrt[ ]{\frac{1}{15-1}*(2173160)}

s=\sqrt[ ]{\frac{2173160}{14}}

s=393.99

The sample standard deviation is 393.99

3 0
3 years ago
The two cities Midway and Union are 40 km from each other. How far apart would the cities be on a map that has a
allochka39001 [22]

Answer:

4cm

Step-by-step explanation:

40÷10=4 and each dm is 10 km

8 0
3 years ago
A company printed 10,398 flyers for its sales people. Each sales person received the same
Vlad1618 [11]

Answer:

3,2,6

Step-by-step explanation:

if you divide 10,398 by all numbers 3,2 and 6 have whole numbers:)

4 0
2 years ago
Read 2 more answers
Sumalee won 40 super bouncy balls playing horseshoes at her schools game last night. Later, she gave two to each of her friends.
Lina20 [59]
Before jumping into doing this problem, it is important to look at all the information's that have been made available in the question. Based on those given conditions the answer to the problem can be easily deduced.
Let us assume the number of friends Sumalee has = x
Then
2x + 8 = 40
2x = 40 -8
2x = 32
x = 32/2
x = 16
So Sumalee has 16 friends. There are numerous ways to get to the answer that is required to be found. This is the easiest and the shortest method. Hope i helped you.
6 0
3 years ago
Read 2 more answers
What is the value of t in this equation?<br> 3t=t+3
Lera25 [3.4K]
3t=t+3\\&#10;2t=3\\&#10;t=\dfrac{3}{2}
8 0
3 years ago
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