All categories

3 years ago

Here are 10 values of a variable x. find the variance using the formula u=x-20

Mathematics

1 answer:

notka56 [123]3 years ago

3 0

Answer:

0.77

Step-by-step explanation:

What we must do is apply the formula they give us and then apply absolute value, add and find the mean of the result and that would be the variance, like this:

18.9 - 20 = -1.1 = 1.1

20.7 - 20 = 0.7 = 0.7

19.3 - 20 = -0.7 = 0.7

20.1 - 20 = 0.1 = 0.1

21.3 - 20 = 1.3 = 1.3

19.6 - 20 = -0.4 = 0.4

20.5 - 20 = 0.5 = 0.5

20.9 - 20 = 0.9 = 0.9

18.8 - 20 = -1.2 = 1.2

20.8 - 20 = 0.8 = 0.8

(1.1 + 0.7 + 0.7 + 0.1 + 1.3 + 0.4 + 0.5 + 0.9 + 1.2 + 0.8) / 10 = 0.77

That is, the variance is 0.77

You might be interested in

I am having trouble learning how to convert an equation to standard form can someone please explain this to me? ( my teacher ten

Molodets [167]

First, you have to simplify the equation:
y+3 = 3(x+5)
y+3=3x+15
So you multiply what’s inside the brackets (x+5) by the factor (3). So 3•x=3x, 3•5=15.
Then you rearrange the equation as necessary to convert it into standard form, which is Ax + By = C

3 0

3 years ago

Explain your model for the problem.

serg [7]

Number of apples=12 times numer of bags=12n

neeeds at least 75 apples (1 per student)
12n≥75
divide both sides by 12
n≥6.25
can't buy 0.25 of a bag
7
needs to buy 7 bags

6 0

3 years ago

Can someone help with this math question please

hoa [83]

The only point in the solution space is that of selection ...
C (1, 3)

5 0

3 years ago

The table shows the distance Randy drove on one day of her vacation

horsena [70]

Given the table showing the distance Randy drove on one day of her vacation as follows:

$\begin{tabular}
{|c|c|c|c|c|c|}
Time (h)&1&2&3&4&5\\[1ex]
Distance (mi)&55&110&165&220&275
\end{tabular}$

The rate at which she travels is given by

$rate= \frac{distance}{time} \\ \\ = \frac{55}{1} =55mi/h$

If Randy has driven for one more hour at the same rate, the number of hours she must have droven is 6 hrs and the total distance is given by

distance = 55 x 6 = 330 miles.

4 0

3 years ago

The cost of parking a motor home in a state park includes a one time fee of $180, plus a daily rate of $55 per day. Anthony prep

HACTEHA [7]

Answer:

Anthony paid for 7 days of parking.

Step-by-step explanation:

From the information given, the cost of parking a motor home in a state park would be equal to the one time fee plus the result of multiplying the daily rate for the number of days:

c=180+55x, where c is the cost of parking the motor home and x is the number of days.

Now, you can replace c with 565 that is the amount Anthony prepaid and you can solve for x to be able to find the number of days he paid for:

565=180+55x

565-180=55x

385=55x

x=385/55

x=7

According to this, Anthony paid for 7 days of parking.

7 0

3 years ago