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ira [324]
2 years ago
10

What is the relationship between the variance and standard deviation? variance is the positive square root of the standard devia

tion?
Mathematics
1 answer:
lana [24]2 years ago
6 0

Variance of a continuous random variable X is defined as

\int\limits_D {(x-\mu)^2f(x)} \, dx

Standard deviation is defined as

\sigma =  \sqrt{Var(X)}

Hence standard deviation is the positive square root of variance.

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If x varies directly as y, then what is y when x = 4,<br> knowing that x = 60 when y = 5?
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Answer:  The answer would be 1/2

Step-by-step explanation:

<em>Y varies DIRECTLY as x. Find the constant of variation, k, if y = -5x </em>

<em>The first sentence is there for information, the constant is a number( 1,2,3...so on) , so the only number is -5 </em>

<em>It is a linear equation meaning equation of a straight line. </em>

<em>its form is y= mx+b, where m is the slope of the line, b is the y intercept when x=0. these info you have to memorize like your life depend on it. </em>

<em>next, y varies directly as x. If y = 15 when x = 60, find y when x = 100 </em>

<em>if y= 15, when x=60, then there is a number m such that m*y= 60 </em>

<em>or m= 60/y= 60/15 =4 </em>

<em>so the equation is y=4x. in this cause, the b=0 </em>

<em>so when x=0, y=0 </em>

<em>The distance a car travels at a constant speed varies directly as the time the car spends traveling. If a car traveled 105 miles in 3 hours, how far could the car travel in 5 hours? </em>

<em>remember that distance = speed times time. </em>

<em>or d=Vt </em>

<em>so car goes 105 miles on 3 hours </em>

<em>how far it goes in one hour? </em>

<em>if you know that, then you can tell how far it goes in 5 hours.</em>

<em>Hope I made it non tough enough</em>

<em>Please give me Brainliest</em>

4 0
3 years ago
Read 2 more answers
Ok help me please guys ..what is 61=3b+7 ?
Neporo4naja [7]
61 = 3b + 7

3b + 7 = 61

3b = 61 - 7

3b = 54

b = 54/3

b = 18.
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2 years ago
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2 .............:)
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Pls help ASAP this is due in 1 hour and i can't figure it out! HELPPP
Paul [167]

the area of the surface of this design is 31 in long

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2 years ago
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If somebody can give me an explanation on how to do this i would appreciate it!
Natali5045456 [20]

The answer is 4+(9x1/10)+(5x1/1000)

Can i have a brainiest

4 0
2 years ago
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