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Ivahew [28]
3 years ago
10

 Jen wants to buy a dress that originally had the price of $33, but now it is on sale 10% off. How much will Jen pay for the dr

ess
Mathematics
1 answer:
valentinak56 [21]3 years ago
8 0

Answer:

$29.70

Step-by-step explanation:

1. First, we have to find how much 10% of 33 is!

  • \frac{10}{100} * 33
  • \frac{330}{100}
  • 3.3

2. Okay, now that we know 3.3 is 10% of 33, we need to subtract 3.3 from 33 to get the amount Jen will pay for the dress.

  • 33 - 3.3
  • 29.7

Therefore, Jen will pay $29.70 for the dress.

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Among a sample of 55 male soldiers the average shower time was found to be 2.95 minutes and the population standard deviation is
Oksanka [162]

Answer: -3.0593

Step-by-step explanation:

The test statistic for the difference between two population mean (when population standard deviations \sigma_1\ \&\ \sigma_2  are known ) is given by :-

z=\dfrac{\overline{x}_1-\overline{x}_2}{\sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma_2^2}{n_2}}}

where ,

n_1\ \&\ n_2 = Sample sizes taken from two  populations 1 and 2.

\overline{x}_1-\overline{x}_2 = Difference between two Sample mean.

\sigma_1\ \&\ \sigma_2 = Standard deviations of populations 1 and 2.

As per given , we have

n_1=55\ \&\ n_2=58

\overline{x}_1=2.95\ \&\ \overline{x}_2=3.3

\sigma_1=0.65\ \&\ \sigma_2=0.56

We assume that the data follows a normal distribution.

Then, the test statistic will be :-

z=\dfrac{2.95-3.3}{\sqrt{\dfrac{(0.65)^2}{55}+\dfrac{(0.56)^2}{58}}}\\\\=\dfrac{-0.35}{\sqrt{0.0130887}}\\\\=\dfrac{-0.35}{0.1144059}=3.05928278174\approx-3.0593  

Hence, the test statistic= -3.0593

5 0
3 years ago
Can anyone help me answer this?
saw5 [17]

Answer:  X=12.7

Step-by-step explanation:

Sorry if its wrong I am pretty rusty with these kind of questions

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Boston had a high temperature this year of 99º. They had a low temperature of -10°.
stealth61 [152]

Answer:

109

Step-by-step explanation:

99+10=109

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