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Bingel [31]
3 years ago
12

What is the standard deviation of the following data set 1,1.2,4,1.28,4.1,5.3?

Mathematics
1 answer:
VikaD [51]3 years ago
3 0
Memorize the definition of standard deviation: the sd is the square root of the average of the squared deviations of the mean. Wow. Let's do it.

Step 1. First we need the mean. That's easy. Add them up and divide by the count. Check if you get 16.88/5 = 2.81333.

Step 2. Now we're going to subtract this from each of the values, and square the result. Don't worry about negative signs, the squaring will get rid of those. Example for the first number:

(1 - 2.813)^2 = 3.29

The list of numbers I get is (rounded, in reality round as little as possible):

3.29, 2.60, 1.41, 2.35, 1.66, 6.18

Step 3: Add them all up. I get 17.49. 
Step 4: Divide by the count of numbers. 17.49/6 = 2.91
Step 5: Take the square root from this result. SQRT(2.91) = 1.707305

TIP: Use excel to do all these steps, then run the set of numbers through Excel's built-in sd function (called  STDEV.P) and see that you get the same result!
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Factor -7x^3+21x^2+3x-9 by grouping. what is the resulting expression?
Daniel [21]

Answer:

c) (3-7x^2)(x-3)

Step-by-step explanation:

-7x^3+21x^2+3x-9

Factor out a -7x^2 from the first two terms and a 3 from the last two terms

-7x^2 (x -3) +3(x-3)

Now factor out (x-3)

(x-3) (-7x^2+3)

Rearranging)

(x-3) (3-7x^2)

8 0
3 years ago
Hexagon a=1.6ft s=3ft what's the area
SpyIntel [72]
A = \frac{3 \sqrt{3} }{2}
A² = \frac{3 · \sqrt{3}}{2} · 1.6²
A = 6.65108
A = 6.65

8 0
3 years ago
Jasmine has to mix 3/4 cup of flour and 3/8 cup of cornmeal she has a container that holds 1 cup can jasmine mix the flour and c
Sladkaya [172]
Because 3/4 and 3/8 is more than one cup, Jasmine will not be able to mix the flour and the cornmeal in the container.

3/4+3/8=6/8+3/8=9/8
5 0
2 years ago
Read 2 more answers
The time, t, required to drive to a certain distance varies inversely with the speed, r. if it takes 12 hours to drive the dista
kap26 [50]
T = k/R  where k is the constant of variation, T=time and R=speed.
Plug in the given values:-
12 = k/60
k = 12*60 = 720
So the equation of variation is T = 720/R

At 85 mph we have

T = 720 / 85 =  8.47 hours (answer)

8 0
3 years ago
Which expression can be used to find 32% of 130?
Gemiola [76]

Answer:

b. 0.32 • 130

Step-by-step explanation:

Change the percent to decimal form

32% = .32

.32 * 130

6 0
3 years ago
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