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Cloud [144]
3 years ago
7

Scott trained for the marathon.

Mathematics
1 answer:
slamgirl [31]3 years ago
6 0

Answer:

See below

Step-by-step explanation:

a)

<u>Day 1</u>

  • 70 min for 10 km
  • Rate = 70/10 = 7 min/km

<u>Day 10</u>

  • 2h40 min for 20 km
  • 2*60+40 = 160 min for 20 km
  • Rate = 160/20 = 8 min/km

<u>Day 20</u>

  • 4 h 15 min for 30 km
  • 4*60 + 15 = 255 min for 30 km
  • Rate = 255/30 = 8.5 min / km

b)

<u>From the rate change we see:</u>

  • 1 min increase when the distance increases from 10 km to 20 km
  • 0.5 min increase when distance increases from 20 km to 30 km

So we see 1 min increase per twice the distance increase

  • With the same rate increase we can expect 1 min increase from 20 km to 40 km, which gives us the rate of 9 min/km
  • With same logic we get 9.055 km/min rate for 44 km distance

<u>Total time it takes:</u>

  • 9.055*44 = 398.42 min = 398.42*1/60 min = 6 h and 38.42 min
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Answer:

\text{Average diameter is 1.65 mm and we decide that it is not 1.65 mm.}                

Step-by-step explanation:

We are given the following in the question:

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We design the null and the alternate hypothesis

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Type I error:

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Thus, type I error in this study would mean we reject the null hypothesis that the average diameter is 1.65 mm but actually the average diameters of the needle is 1.65 mm.

Thus, average diameter is 1.65 mm and we decide that it is not 1.65 mm.

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Answer:

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Step-by-step explanation:

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