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sammy [17]
3 years ago
13

In a survey of first graders, their mean height was 51.6 inches with a standard deviation of 3.6 inches. Assuming the heights ar

e normally distributed, what height represents the first quartile of these students?
Mathematics
1 answer:
ki77a [65]3 years ago
6 0

Answer:

Step-by-step explanation:

In a survey of first graders, their mean height was 51.6 inches with a standard deviation of 3.6 inches. Assuming the heights are normally distributed, what height represents the first quartile of these students?

54.03 inches

48.57 inches

48.00 inches

49.17 inches

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katen-ka-za [31]

Step-by-step explanation:

In simple terms it is, -2-3= -5

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3 years ago
What value of x makes the function {(1,5), (x,8), (-7,9)} a function?
mestny [16]
X can be anything you want as long as it is not 1 or -7. If you have repeated x values with different y values, then it won't be a function. 
5 0
4 years ago
─4(15 + 4 + 5) and 12(21 ─ 63 + 42)<br><br> With work!!
Leni [432]

Answer:

-4 x 15 = -60                        12 x 21 = 252

-4 x 4 = -16                           12 x 63 = 756

-4 x 5 = -20                          12 x 42 = 504

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Step-by-step explanation:

distributive property on both sides

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8 0
3 years ago
Solve –2.8(z + 1) – (3.5z – 9) = –31.6 for z. A. –1.32 B. 0.94 C. 6 D. –7.72
andreyandreev [35.5K]

Answer:

z=6

Step-by-step explanation:

-2.8\left(z+1\right)-\left(3.5z-9\right)=-31.6

-6.3z+6.2=-31.6

-6.3z+6.2-6.2=-31.6-6.2

-6.3z=-37.8

\frac{-6.3z}{-6.3}=\frac{-37.8}{-6.3}

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4 0
4 years ago
In the system of equations, r and s are constants. If the system has infinitely many solutions, what is the value of rs?
exis [7]

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Step-by-step explanation:

If the system of two linear equations a_1x+b_1y=c_1\ \&\ a_2+b_2y=c_2 has infinitely many solutions , then

\dfrac{a_1}{a_2}=\dfrac{b_1}{b_2}=\dfrac{c_1}{c_2}=k

For the given system of linear equations : rx-sy=26\\4x+3y=13

We , will have

\dfrac{r}{4}=\dfrac{-s}{3}=\dfrac{26}{13}=2\\\\\Rightarrow\ r= 4\times2=8\ \ \&\ \ s=2\times-3=-6

The value of rs=(8)\times-6=-48

Hence, the value of rs is -48.

Thus , the correct option is B) -48.

6 0
3 years ago
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