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vovikov84 [41]
2 years ago
11

If x2 = 81, what are the TWO answers?

Mathematics
2 answers:
Sphinxa [80]2 years ago
8 0
Your answer is 9, -9
nika2105 [10]2 years ago
4 0

Answer:

9 and -9

Step-by-step explanation:

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A woman is randomly selected from the 18-24 age group. For women of this group, systolic blood pressures (in mm Hg) are normally
dybincka [34]

Answer:

0.0274

Step-by-step explanation:

The mean is \mu =114.8 and the standard deviation is \sigma =13.1.

Calculate

Z=\dfrac{X-\mu}{\sigma}

for X=140:

Z=\dfrac{140-114.8}{13.1}\approx 1.9237.

If X\sim N(114.8,\ 13.1), then Z\sim N(0,1)

and

Pr(X>140)=Pr(Z>1.9237).

Use table for normal distribution probabilities to get that

Pr(Z>1.9237)=1-Pr(Z\le 1.9237)=1-0.9726=0.0274.

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3 years ago
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Step-by-step explanation:

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3 years ago
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How do you choose between mean and median as the best measure for the center of a distribution?
OverLord2011 [107]
That would be the median I think...
7 0
3 years ago
Simplify:0.3(x-2y)+0.5x-y
astraxan [27]

Answer:

0.3[x-2y] + 0.5x - y


Use the distributive property: a(b-c) = ab - ac


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