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3 years ago

I NEED THE ANSER TO NUMBER 9 And 11

Mathematics

1 answer:

Tamiku [17]3 years ago

3 0

Answer:1. the 1 one do a half base×height ( 1/2 × 9×17).

2. the second one do 15 ×18 and 20×9 then subtract the2 answers

=15×8=270 20×9=180 270-180=90.

=90

please mark me the brainlest.

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Answer:

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Step-by-step explanation:

We are given the following data set:

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$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

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Putting the values, we get,

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