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zepelin [54]
1 year ago
5

I don’t understand this problem

Mathematics
1 answer:
Rina8888 [55]1 year ago
7 0

Answer:

Standard Deviation, σ = 6.5828058860438

Step-by-step explanation:

<u>Data Set:</u> 20, 11, 27, 13, 29, 20

The total numbers in the data set

Count, N = 6

The sum is all values in the data set is added up

20 + 11 + 27 + 13 + 29 + 20

Sum, Σx: 120

The mean is the sim / N

Mean, μ: 20

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3 years ago
A radio station ordered hats and coffee mugs to give away as prizes. A total of 1,000 of these items were ordered, and 3 times a
marshall27 [118]

Answer:

The options are not shown, so i will answer in a general way.

Let's define the variables:

h = number of hats

m = number of mugs.

We know that a total of 1000 items were ordered, then:

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We also know that we have 3 times more mugs than hats, this can be written as:

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Now we have the system of equations:

h + m = 1000

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To solve these, we usually start by isolating one of the variables in one equation and then replace that in the other equation, but in this case, we already have m isolated in the second equation, then we can replace that in the first equation to get:

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Now we can solve this equation for h, and find the number of hats ordered.

4*h = 1000

h = 1000/4 = 250

There were 250 hats ordered.

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