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Andreas93 [3]
3 years ago
8

Isabel walks 1.5km every day. How far does she walk in 5 days? Write your answer in meters

Mathematics
2 answers:
aleksandrvk [35]3 years ago
4 0
----------------------------------
Find 5 days :
----------------------------------
1 day = 1.5km
5 days = 1.5 x 5 = 7.5 km

----------------------------------
Convert km to m
----------------------------------
1 km = 1000 m
7.5km = 7.5 x 1000
7.5 km = 7500 m

--------------------------------------------------------------------
Answer: She walked 7500 m
--------------------------------------------------------------------
Goshia [24]3 years ago
4 0
1.5km times 5 = 7.5 km.

Answer: 7500 meters, because there is 1000 meters in 1 kilometer.
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Answer:

Brand 1    Brand 2    Difference

37734       35202        2532

45299      41635         3664

36240      35500        740

32100      31950         150

37210       38015       −805

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Sum of difference = 2532+ 3664+740+150 −805+  560 +390 +285 = 7516

Mean = d=\frac{7516}{8}

Mean = d=939.5

a) d= 939.5

\text{Sample Standard deviation, s} = \sqrt{\dfrac{(x-\bar{x})^2}{n-1}}

=\sqrt{\dfrac{(2532-939.5)^2+(3664-939.5)^2+(740-939.5)^2 ...+(285-939.5)^2}{8-1}}

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b)SD= 1441.21

c)Calculate a 99% two-sided confidence interval on the difference in mean life.

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significance level =α= 0.01

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So, t_{\frac{\alpha}{2}}=3.499

Formula for confidence interval = \left( \bar{X} \pm t_{\frac{\alpha}{2}} \times \frac{s}{\sqrt{n}} \right)

Substitute the values

confidence interval = 939.5 \pm 3.499 \times \frac{1441.21}{\sqrt{8}} \right)

confidence interval = 939.5 - 3.499 \times \frac{1441.21}{\sqrt{8}} \right) to  = 939.5 + 3.499 \times \frac{1441.21}{\sqrt{8}} \right)

Confidence interval −843.396\ to  2722.396

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