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3 years ago

I need super, duper, help. -9 +(-1) 2 squared

Mathematics

2 answers:

kati45 [8]3 years ago

7 0

Answer:8

Step-by-step explanation:

-9 +(-1) 2 squared

$-9+(-1)^{2}$

is it correct ?

for the answer is

-9+(-1*-1)=

-9+1=8

riadik2000 [5.3K]3 years ago

4 0

Answer:

-11

Step-by-step explanation:

-9 +(-1) 2

-9 - 1 x 2

-9 - 2

-11

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Answer:

The standard error of the mean is 4.5.

Step-by-step explanation:

As we don't know the standard deviation of the population, we can estimate the standard error of the mean from the standard deviation of the sample as:

$\sigma_{\bar{x}}\approx\frac{s}{\sqrt{n}}$

The sample is [30mins, 40 mins, 60 mins, 80 mins, 20 mins, 85 mins]. The size of the sample is n=6.

The mean of the sample is:

$\bar{x}=\frac{1}n} \sum x_i =\frac{30+40+60+80+20+85}{6}=52.5$

The standard deviation of the sample is calculated as:

$s=\sqrt{\frac{1}{n-1}\sum (x_i-\bar x)^2} \\\\ s=\sqrt{\frac{1}{5}\cdot ((30-52.5)^2+(40-52.5)^2+(60-52.5)^2+(80-52.5)^2+(20-52.5)^2+(85-52.5)^2}\\\\s=\sqrt{\frac{1}{5} *3587.5}=\sqrt{717.5}=26.8$

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3 years ago

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3 years ago

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Step-by-step explanation:

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3 years ago

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Using the median concept, the correct statement is given as follows:

Her median score does not change.

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The median of the data-set separates the bottom half from the upper half, that is, it is the 50th percentile, also called the middle value the data-set, not being affected by outliers.

For this problem, the data-set is given as follows:

7.50, 7.50, 7.75, 7.75, 8.00, 8.00, 8.00, 10.00.

There are 8 scores, hence the median is the <u>mean of the 4th and the 5th</u> scores, as follows:

(7.75 + 8)/2 = 7.875.

Removing the extreme values, the data-set will be given by:

7.50, 7.75, 7.75, 8.00, 8.00, 8.00.

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Her median score does not change.

More can be learned about the median of a data-set at brainly.com/question/23923146

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3 years ago

Read 2 more answers