Answer:
Step-by-step explanation:
The standard deviation is the square root of the variance, and the variance is found by using the mean. So we will do that first. I will use the population variance as opposed to the sample variance since our set of numbers is small.
The mean: 8 + 12 + 15 + 17 + 18 = 70 and divide that by 5 to get
and use this to find the variance in the formula:
it is a bit difficult to enter that formula in correctly, but here's how it works mathematically:
Squaring this ensures us that we don't end up with zero, which would be useless.
so
which means that the standard deviation is
s = 3.633
(If you do it with n-1 = 4 in the denominator of the variance, you get a standard deviation of 4.062)
There are 50 sections.
Step-by-step explanation:
Given,
Length of section = 10 meters
Total length of guardrail = 0.5 km
We will convert this length in meters.
1 km = 1000 meters
0.5 km = 0.5*1000 = 500 meters
Now,
No. of sections =
No. of sections =
No. of sections = 50
There are 50 sections.
Assuming that you mean 100cm in length, I think I know the answer, but message me if I’m wrong so that I can correct myself!!!
Volume is L • W • H where L is length, W is width, and H is height.
To find the volume you have to multiply all the dimensions, so 100 * 30 * 12 = 36,000, and since its 3 dimensional we use cm^3 which is centimetres cubed.
x = Nora's saved quarters we dont know full answer yet
2x + 6 = quarters Chris saved
5(x-3)= five times the difference of quarters and 3noras .
Now put equations together to solve.
2x + 6 = 5(x - 3)
Remove parentheses
2x + 6 = 5x - 15
Subtract 5x to both sides and solve x.
-3x + 6 = -15
Now subtract 6 both sides and solve
-3x = -21
x = 7 = Nora quarters
Chris original problem and substitute for x .
2x + 6 =
2 (7) + 6 =
14 + 6 = 20 quarters
So Nora has 7 quarters and Chris 20
Answer:
x = 18
y = 27
Step-by-step explanation: