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Gala2k [10]
3 years ago
6

The mean of 100 numerical observations is 51.28 what is the value of the sum of all 100 numbers

Mathematics
1 answer:
zlopas [31]3 years ago
8 0
\dfrac{x_1+x_2+\cdots+x_{99}+x_{100}}{100}=51.28

which means the sum of the 100 numbers must be

x_1+x_2+\cdots+x_{99}+x_{100}=100\times51.28=5128
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Can someone please help me with 44. And 45?
Angelina_Jolie [31]

Problem 44

The term "bisect" means "cut in half".

Since BD bisects angle ABC, this means the smaller angles ABD and DBC are congruent.

angle ABD = angle DBC

x+15 = 4x-45

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60 = 3x

3x = 60

x = 60/3

x = 20

<h3>Answer:  x = 20</h3>

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

Problem 45

We use the same idea as the previous problem

angle ABD = angle DBC

2x+35 = 5x-22

35+22 = 5x-2x

57 = 3x

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6 0
2 years ago
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7 is 28% of what number
zvonat [6]
25 hope it helps have a great day :)
7 0
3 years ago
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According to The Wedding Report, Inc., the mean cost for a wedding in the United States is $28732 (as of November 2008). Suppose
Stella [2.4K]

Answer:

Following are the solution to the given points:

Step-by-step explanation:

X = \text{cost of wedding}\sim \text{Normal}\ (\mu = 28732, \sigma= 1500)\\\\

For point a:

Probability\ = 0.00000359\\\\ \text{(Using Excel function:} =NORMDIST(22000,28732,1500,1)).

For point b:

Probability \ = 0.014678\\\\\text{(Using Excel function:} =1-NORMDIST(32000,28732,1500,1))\\\\

For point c:

Probability\ = 0.794614436 \\\\

\text{(Using Excel function:} \\=NORMDIST (30000,28732,1500,1)-NORMDIST(25000,28732,1500,1))\\\\

For point d:

Q_1 = 27720.26537 \\\\\text{(Using Excel function:} =NORMINV(0.25,28732,1500)) \\\\Q_3 = 29743.73463 \\\\\text{(Using Excel function:} =NORMINV(0.75,28732,1500)).

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For point f:

Top\  10\% = 30654.32735 \\\\\text{(Using Excel function:} =NORMINV(0.9,28732,1500)).

5 0
3 years ago
Helping others makes a person good ​
oksano4ka [1.4K]

Answer:

9 cm.

Step-by-step explanation:

Let the height of the pyramid be h cm, then the height of the cuboid is (15 - h) cm.

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= 1/3 * h * s^2      where s is the length of a side of the square base.

= hs^2/3 cm^3

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= s^2(15 - h).

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Multiply through by h:

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h = 9 cm (answer).                  brainliest?

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3 years ago
Ámala caught 54 fishes, she released 5/6 how many she keep
matrenka [14]
9 fish (:
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I hope you find this useful, and, if so, please mark as brainliest :P
Good luck!
4 0
3 years ago
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