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3 years ago

which of the following choices is the standard deviation of the sample shown below here 17,18,19,20,21

1 answer:

4 0

Where are "the following choices?" Please don't overlook sharing this info with possible helpers. Thank you.

This kind of assignment can be one on a calculator; I typed in stdDev(17,18,19,20,21) an got std dev= 1.58.

working backward, the variance is the square of that: 2.5.

To find the variance: Find the mean of the given set of numbers. It is

17+18+19+20+21 95
------------------------- = ----- = 19
5 5

and then calculate the deviations of all 5 numbers from the mean:

17-19=-2
18-19= -1
19-19=0
20-19 = 1
21-19=2

Then sum up the squares of these: 4+1+0+1+4 = 10
Finally, divide this result by 5-1 (one less than the # of data points):

10
------- = 2.50 (variance)
(5-1)

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Graph f(x)=−3/4x−4 . Use the line tool and select two points to graph the line.

lions [1.4K]

Answer:

Two points on the line would be (0, -4) and (4, -7)

Step-by-step explanation:

In order to find this, we can start at the y-intercept. The y-intercept is the constant at the end of the equation. In this case it is -4, which gives us the first point of (0, -4).

We can find the second point by using the numerator of the slope to determine how much we go up or down (-3) and the denominator for how much we go left to right (4). So we add the 4 to the x value and add the -3 to the y value.

(4, -7)

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3 years ago

A contractor estimates $2,400 to build a deck to a customer’s specifications, How much would it cost to build five similar decks

Bumek [7]

5*2400=$12,000 is the total costs for 5 decks costing $2,400 each.

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3 years ago

Lindsey Wilson was the top scorer in a women's professional basketball league for the 2006 regular season, with a total of 814 p

baherus [9]

Answer:

The number of free throws, two-point throw, and three-point throw are 135, 173, and 111 respectively.

Step-by-step explanation:

Let x,y, and z are the numbers of two-point field goals, numbers of three-point field goals, and the number of free-throws (one-point goal) respectively.

The total points= 814

$\Rightarrow 2x+3y+z=814\;\cdots(i)$

As the number of two-point goals was 49 less than double the number of three-point field goals she made.

$\Rightarrow x=2y-49 \;\cdots(ii)$

Again, the number of free goals was 38 less than the number of two-point field goals she made.

$\Rightarrow z=x-38\;\cdots(iii)$

From equations (i) and (iii)

2x+3y+x-38=814

$\Rightarrow 3x+3y=852$

$\Rightarrow x+y=284$

$\Rightarrow 2y-49+y=284$ [using equation (ii)]

$\Rightarrow 3y=333$

$\Rightarrow y=111$

From equation (ii),

$x= 2\times111-38=173$

From equation (iii),

$z=173-38=135$ .

Hence,

The number of free throws, z= 135

The number of two-point throw, x=173

The number of three-point throw, y=111.

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3 years ago

Trail mix made for three people uses 3 cups of almonds, 1 cup of raisins and 1/3 cup of chocolate chips. If the same ratio of in

kvv77 [185]

Hello!

Since this amount we are given an amount we need for 3 people, we just multiply each amount by four to get to 12.

12 cups of almonds
4 cups of raisins
1 1/3 cups of chocolate chips

I hope this helps!

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3 years ago

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There are three shapes in front of you. The square has a side of 4 meters.

jolli1 [7]

Answer:

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3 years ago