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3 years ago

15.3+1 (1.10).-1:9 (11.5)-12=

Mathematics

1 answer:

irina1246 [14]3 years ago

5 0

Step-by-step explanation:

$15 \times 3 = 45 \\ 45 + 1 = 46 \\ 1 \times 10 = 10 \\ 46 + 10 = 56 \\ 56 - 19 = 37 \\ 11 \times 5 = 55 \\ 55 + 37 = 97 \\ 97 - 12 = 80$

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Which of the following choices is the standard deviation of the sample shown

lana66690 [7]

Answer: E. square root of 2

We can write that in shorthand as sqrt(2)

sqrt(2) = 1.41421 approximately

======================================================

Explanation:

Step 1)

Add up the values to get 18+19+20+21+22 = 100

Divide by n = 5, since there are 5 items in the list. So 100/n = 100/5 = 20

The sample mean is xbar = 20

--------------

Step 2)

Subtract the mean from each data value

18 - xbar = 18 - 20 = -2
19 - xbar = 19 - 20 = -1
20 - xbar = 20 - 20 = 0
21 - xbar = 21 - 20 = 1
22 - xbar = 22 - 20 = 2

The results we get are: -2, -1, 0, 1, 2

---------------

Step 3)

Square the results from the previous step

(-2)^2 = 4
(-1)^2 = 1
(0)^2 = 0
(1)^2 = 1
(2)^2 = 4

The results here are: 4, 1, 0, 1, 4

---------------

Step 4)

Add up those squares from the previous step: 4+1+0+1+4 = 10

Now divide by n = 5 to get 10/n = 10/5 = 2

The result 2 represents the population variance. Applying the square root to the population variance leads to the population standard deviation. So we end up with the final answer of sqrt(2). The answer is choice E.

sqrt(2) = 1.41421 approximately

---------------

Note: if you want the sample standard deviation, then you divide by n-1 = 5-1 = 4, but the other steps are the same as before.

7 0

3 years ago

How many tires are there if you have 10 bicycles?

mash [69]

20 bicycles. two tires per one bike. 2*10=20

3 0

3 years ago

Read 2 more answers

The 3 by 3 grid below shows nine 1 cm × 1 cm squares and uses 24 cm of wire. What length of wire is required for a similar 20 by

Nady [450]

Answer:

840

Step-by-step explanation:

Hi there!

Usually, this kind of problem asks us the perimeter rather than the area. But when talking on this grid on how many cms are necessary to construct one made up of 9 squares 1cm x1 cm. We need to check one thing: Some line segments will be used twice. So this is not a classical perimeter question.

1) So we either manually and carefully count it avoiding not doing it twice the same common line segments.

Or.

2) By just applying an algorithm, Where n is the <em>nxn</em> grid

$n(n+1)+n(n+1)=Length \:of \:the \:wire$

So, for the 20x20 grid

$20(20+1)+20(20+1)=length\\\\20(21)+20(21)=length\\length=840 cm$

5 0

4 years ago

The staff at the arcola country club prepares tables for a wedding reception they are able to prepare 6 tables in 45 minutes how

Nezavi [6.7K]

4 hours=240 minutes
240 minutes=5 1/3 45 min. intervals
5 1/3 x 6 = 16/3 x 6 = 32

The staff can prepare 32 tables in 4 hours

8 0

4 years ago

Can someone help me please..

Elza [17]

So just find circumference is
circumfernce=2pir or pid
so diameter 2.5 ft
just for this problem aprox pi=3.14 so
c=pid
c=3.14(2.5)
c=7.85

a. 7.85 ft

b. how many times revolution till one mile (5280)
so
7.85 times x revolutions=5280
divide both sides b y7.85
x revolutions=672.61
round up so we complete the mile (about how many times..)
673 is the answer

a. 7.85 ft
b. 673 times

5 0

3 years ago