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olga_2 [115]
3 years ago
11

A set of data with a mean of 45 and a standard deviation of 8.3 is normally distributed. Find the value that is +3 standards dev

iation away from the mean
Mathematics
1 answer:
Sonbull [250]3 years ago
3 0
8.3 × 3 = 24.9

45 + 24.9 = 69.9

Hope this helps!
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Solve the system of equations using subtraction. <br> 2x - 4y = - 12 <br>2x + y = 13​
alisha [4.7K]
First can you change
2x + y = -12
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Looks like y = ???
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HELPP ITS A 60 min test and a alr took up most of my time watching t|k tok :} so now i have 20 mins left I will Give Brainlest!
soldi70 [24.7K]

Answer:

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The "inverse operation" is just a way of saying "what do you do to isolate the variable". In this case, we isolate y, so we have to move all terms to the right side. To do that, we subtract 12 from each side to there will only be "y" on the left side.

8 0
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A recipe includes 6 cups of flour and 2/3 cup of butter. Write the ratio of the amount of flour to the amount of butter as a fra
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6 : 2/3.....multiply by 3
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6 0
3 years ago
For each function below, determine whether or not the function is injective and whether or not the function is surjective. (You
Harlamova29_29 [7]

Answer: First, injective means that for every y, there is only one x such f(x) = y, and surjective means that if f is a function that goes from the set {x} to the set {y}, for every element y in the codomain there is at least one element x in the domain such f(x) = y

(a) f:R----> + R given by f(x) = x2 (i guess you written x^{2})

The function is not injective, because f(-2) = f(2), and is surjective, because the codomain is +R, and x^{2} is always a positive real number.

(b) f:N----> + N given by f(n) = n2  (i guess you written n^{2})

As the naturals have no negative numbers, in this case the function is injective, but isn't surjective, because there is no number that when squared is equal to 5, for example.

(c) f: Zx Z → Z given by f(n, k) = n +k:

here the domain is of the form (n,k) and the function is n +k, so the numbers (z,w) and (w,z) return the same value when evaluated in f, then f is not injective. And is easy to see that f is surjective, because in the sum you can reach al the integers on the codomain.

3 0
3 years ago
Two poles of lengths 10 ft and 15 ft are set up vertically with bases on horizontal ground 12 ft apart. Find the distance betwee
svp [43]

The distance between the tops of the poles is the hypotenuse of the triangle which is equal to the square root of (12^2 + 5^2)

The hypotenuse = square root (144 + 25) = 13 ft

5 0
3 years ago
Read 2 more answers
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