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2 years ago

Help plz my teacher didn't explain how i'm supposed to solve these

Mathematics

1 answer:

Gnesinka [82]2 years ago

5 0

Answer: See below for each answer. I did it step by step.

Step-by-step explanation:

90=(x+18)+x 90-18=x+x 90-18=2x 72=2x x=36

90=(x-52)+x 90+52=2x 142=2x x=71

180=(x-10)+(x-20)+x 180+10+20=3x. 190+20=3x 210=3x x=70

90=(x+36)+x 90-36=2x 54=2x x=26

90=(x+10)+(x+10) 90-10-10=2x 80-10=2x 70=2x x=35

180=(x+20)+x 180-20=2x 160=2x x=80

180=(x-14)+x 180+14=2x 194=2x x=97

180=(x+20)+(x+10) 180-20-10=2x 160-10=2x 150=2x x=75

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3 years ago

Find the population mean or sample mean as indicated. Sample: 19, 15, 6, 11, 24 Compute the sample mean for this data set. Selec

yKpoI14uk [10]

Answer:

$\overline{x}=15$

Step-by-step explanation:

the mean is given by:

$\overline{x} = \dfrac{\sum\limits_{i=1}^n x_i}{n} \quad\text{or}\quad \dfrac{\text{sum of all items}}{\text{number of items}}$

In our case this is:

$\overline{x} = \dfrac{19+15+6+11+24}{5} \Rightarrow \dfrac{75}{5}\\\\\overline{x} = 15\\\\$

side note: the main difference between sample mean and population mean is in the 'context'. However, the method to calculate them is the same.

By context I mean: if this the items are taken from some larger category for example: the ages of a few 'students' from a 'class'. Here 'students' are the sample from a larger set that is 'class'. The mean of the 'few students' will be called sample mean. In contrast, if we take the mean of the ages of the whole class then this is called population mean. (population mean == mean of the whole set)

In our case we aren't told exactly where these numbers come from, is this the whole set or a sample from it, the lack of context allows us to assume that the mean can either be population mean or sample mean. So we can safely use any symbol $\mu$ or $\overline{x}$ .

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3 years ago

Use the equation given below to help you determine Which statement best describes how you find the net change in an your answer.

Ksivusya [100]

Answer:

A is the answer I go with although Im not that sure

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2 years ago

The football team has a total of 350 jerseys there are 154 medium-sized jerseys. What percent of the jerseys are medium-sized j

Lena [83]

Answer:

44% of the jerseys are medium sized.

Step-by-step explanation:

Total jerseys football team has = 350

Medium-sized jerseys = 154

We need to find what percent of the jerseys are medium-sized jerseys.

The formula used will be: $Percent\:of\:medium\:size\:jerseys=\frac{Medium\:size\:jerseys}{Total\:jersey}\times 100$

Putting values and finding percentage

$Percent\:of\:medium\:size\:jerseys=\frac{Medium\:size\:jerseys}{Total\:jersey}\times 100$

$Percent\:of\:medium\:size\:jerseys=\frac{154}{350}\times 100\\Percent\:of\:medium\:size\:jerseys=0.44\times 100\\Percent\:of\:medium\:size\:jerseys=44\%$

So, 44% of the jerseys are medium sized.

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2 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

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