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3 years ago

The standard deviation of the data set is 2.3. Compute the variance to the nearest hundredth. 2,2,2,3,5,5,6,7,8

1 answer:

7 0

The standard deviation is the square root of the variance...so that means the variance is the standard deviation squared.

2.3^2 = 5.29 <===

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Given f(x)=x - 1/x and g(X)+ 1/x. what is f(g(1/2))?

Debora [2.8K]

Assuming the plus sign is supposed to be an equal sign, the answer is 3/2. If not, the answer is 21/10.

3 0

3 years ago

5x - 2 - 9<br> x + y = -3

erik [133]

Answer:

whats the question you need to answer?

3 0

3 years ago

Sam gets paid a set rate in his allowance for making his bed every morning. His rate is $0.50 earned for every morning that he m

AlekseyPX

Answer:

bottom graph of left picture

Step-by-step explanation:

For each day he makes his bed, he earns $0.50

In 1 day he earns $0.50

In 2 days he earns $1.00

In 3 days, he earns $1.50

...

In 8 days, he earns $4.00

Look in the 4 graphs.

Which graph has the following points, (1, 0.5), (2, 1), 3, 1.5), ... , (8, 4)?

It is the second graph (bottom graph of left picture.)

4 0

2 years ago

A soccer player uses her head to hit a ball up in the air from a height of 2 meters with an initial vertical velocity of 5 meter

Mandarinka [93]

Answer:1.32 s

Step-by-step explanation:

Given

The initial height of ball H=2 m

Initial velocity u=5 m/s

Height of ball at any instant is given by

$H=-4.9t^2+5t+2$

The ball will hit the ground when h=0

$-4.9t^2+5t+2=0\\4.9t^2-5t-2=0\\t=\dfrac{5\pm\sqrt{25+4(4.9)(2)}}{2\times 4.9}\\t=\dfrac{5\pm\sqrt{64.2}}{9.8}\\t=\dfrac{5+8.01}{9.8}=1.32\ s\quad\text{Neglecting negative value of t}$

3 0

3 years ago

Can someone please help me with this square root problem?

vovikov84 [41]

Answer:

Rational, Rational, Rational, Irrational, Irrational

Step-by-step explanation:

The first question:

-√49
-7

This number is rational

Second:

-70.8888....

This number is rational. It wouldn't be rational if the digits won't repeat.

Third:

15.91

This number is rational

Fourth:

17π

This is irrational. The digits of pi do not repeat, making it irrational.

Fifth:

-√14

Irrational. The square root of a non-perfect square is irrational.

<h3 />

-Chetan K

5 0

2 years ago