2 years ago

Laser Challenge Desmos Challenge #1: Hit the Targets.

Mathematics

1 answer:

babymother [125]2 years ago

4 0

Answer:

What is this for?

Step-by-step explanation:

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Solve for X <br><br> Will give brainiest

madreJ [45]

Answer:

x = -6

Step-by-step explanation:

y + 64 + 27 = 180

y + 91 = 180

y = 89

x + 97 + y = 180

x + 97 + 89 = 180

x + 186 = 180

x = -6

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The two-way table shows the results of a recent study on the effectiveness of the flu vaccine.

Margarita [4]

Answer: 465/950

Step-by-step explanation:

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Given the following discrete uniform probability distribution, find the expected value and standard deviation of the random vari

katovenus [111]

The expected value is

$E[X]=\displaystyle\sum_xx\,P(X=x)=\frac1{11}\sum_{x=0}^{10}x=\dfrac{0+1+\cdots+9+10}{11}=\dfrac{55}{11}=\boxed{5}$

The standard deviation is the square root of the variance, which is

$V[X]=E[(X-E[X])^2]=E[X^2]-E[X]^2$

where

$E[X^2]=\displaystyle\sum_xx^2\,P(X=x)=\frac1{11}\sum_{x=0}^{10}x^2=\dfrac{0^2+1^2+\cdots+9^2+10^2}{11}=\dfrac{385}{11}=35$

so that

$V[X]=35-5^2=10$

making the standard deviation

$\sqrt{V[X]}=\sqrt{10}\approx\boxed{3.16}$

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2 years ago

Use proportional reasoning to find 65% of 200

AVprozaik [17]

X/200=65/100
200*65=100x
13,000=100x
x=130

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You decide you will buy a stock only if it shows an overall increase over the next 30 days. The first 10 days, it has an average

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B) 4.50 dollars. 10 times.45
C) 2.50 dollars. 10 times.25
D)10 dollars. 4.50+2.50+3.00
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