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4 years ago

Please help with this

Mathematics

1 answer:

kramer4 years ago

3 0

Answer:

A. 120

Step-by-step explanation:

The rest of the answers are acute.

120 is the only one that matches the type of angle <V is.

Always pay attention to the type of angle it is.

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I can’t figure this out

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$\dfrac{AB}{BC}=\dfrac{PQ}{QR}\\\\\dfrac{27}{45}=\dfrac{33}{QR}\\\\\dfrac{3}{5}=\dfrac{33}{QR}\\\\3QR=33\cdot5\\QR=11\cdot5\\QR=55$

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4 years ago

Read 2 more answers

Suppose that the age that children learn to walk is normally distributed with mean 12 months and standard deviation 1 month. 19

Gnesinka [82]

Answer with explanation:

Given : The age that children learn to walk is normally distributed with $\mu=12\text{ months}$ and $\sigma=1\text{ month}$ .

Let x be the age that children learn to walk .

B) Using formula $z=\dfrac{x-\mu}{\dfrac{\sigma}{\sqrt{n}}}$

n= 19

For x= 11.5

$z=\dfrac{11.5-12}{\dfrac{1}{\sqrt{19}}}=-2.18$

For x= 12.5

$z=\dfrac{12.5-12}{\dfrac{1}{\sqrt{19}}}=2.18$

Then, by using the z-value table , for the 19 people, the probability that the average age that they learned to walk is between 11.5 and 12.5 months old will be :-

$P(-2.18$

Hence, for the 19 people, the probability that the average age that they learned to walk is between 11.5 and 12.5 months old = 0.9707

C. Using formula $z=\dfrac{x-\mu}{\sigma}$

For x= 11.5

$z=\dfrac{11.5-12}{1}=-0.5$

For x= 12.5

$z=\dfrac{12.5-12}{1}=0.5$

Then, by using the z-value table , the probability that the average age that they learned to walk is between 11.5 and 12.5 months old will be :-

$P(-0.5$

Hence, the probability that the average age that they learned to walk is between 11.5 and 12.5 months old = 0.3829

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4 years ago