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3 years ago

an item regular price of $40 . Kira bought it on sale for 65% off the regular price. How much did he Kira pay?

Mathematics

1 answer:

inna [77]3 years ago

8 0

The answer is $14 because 65% of $40 is 26 and 40-26=14

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Step-by-step explanation:

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3 years ago

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A machine in a factor makes 2o gidgets every 1/4 hour. How many gidgets are made every hour ?

Dahasolnce [82]

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3 years ago

Need help pls<br>thank you in advance

ira [324]

Answer:

<u />

$\textsf{Mean}\:\overline{X}=\sf \dfrac{\textsf{sum of all the data values}}{\textsf{total number of data values}}$

$\implies \sf Mean\:(Nilo)=\dfrac{5+6+14+15}{4}=\dfrac{40}{4}=10$

$\implies \sf Mean\:(Lisa)=\dfrac{8+9+11+12}{4}=\dfrac{40}{4}=10$

<h3><u>Standard Deviation</u></h3>

$\displaystyle \textsf{Standard Deviation }s=\sqrt{\dfrac{\sum X^2-\dfrac{(\sum X)^2}{n}}{n-1}}$

$\begin{aligned}\displaystyle \textsf{Standard Deviation (Nilo)} & =\sqrt{\dfrac{(5^2+6^2+14^2+15^2)-\dfrac{(5+6+14+15)^2}{4}}{4-1}}\\\\& = \sqrt{\dfrac{482-\dfrac{40^2}{4}}{3}}\\\\& = \sqrt{\dfrac{82}{3}}\\\\& = 5.23\end{aligned}$

$\begin{aligned}\displaystyle \textsf{Standard Deviation (Lisa)} & =\sqrt{\dfrac{(8^2+9^2+11^2+12^2)-\dfrac{(8+9+11+12)^2}{4}}{4-1}}\\\\& = \sqrt{\dfrac{410-\dfrac{40^2}{4}}{3}}\\\\& = \sqrt{\dfrac{10}{3}}\\\\& = 1.83\end{aligned}$

<h3><u>Summary</u></h3>

Nilo has a mean score of 10 and a standard deviation of 5.23.

Lisa has a mean score of 10 and a standard deviation of 1.83.

The <u>mean</u> scores are the <u>same</u>.

Nilo's standard deviation is higher than Lisa's. Therefore, Nilo's test scores are more <u>spread out</u> that Lisa's, which means Lisa's test scores are more <u>consistent</u>.

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2 years ago

Help me thxs! I have a problem finding the answer

insens350 [35]

905 whatever that is (I forgot)

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3 years ago

From $18 to $45 find each percent increase round to the nearest percent please help

lapo4ka [179]

<h2>Greetings!</h2>

Answer:

250%

Step-by-step explanation:

To find the percent increase, divide the end amount by the primary amount:

45 ÷ 18 = 2.5

Now simply multiply this value by 100:

2.5 x 100 = 250

So the percent increase is 250%!

<h2>Hope this helps!</h2>

3 0

3 years ago

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an item regular price of $40 . Kira bought it on sale for 65% off the regular price. How much did he Kira pay?​

an item regular price of $40 . Kira bought it on sale for 65% off the regular price. How much did he Kira pay?