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Firdavs [7]
3 years ago
9

To qualify as a contestant in a race, a runner has to be in the fastest 16% of all applicants. The running times are normally di

stributed, with a mean of 64 min and a standard deviation of 5 min. To the nearest minute, what is the qualifying time for the race?
Mathematics
1 answer:
adell [148]3 years ago
4 0
It is within 5 minutes ahead or behind 5 minutes of 64 minutes because deviantion means a different face value than the original hope this helps
if i had some answer choices i could give you the exact answer but here is my best answer for you.

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A ferry departs from a port along the Sands River at 10:00 am. The ferry travels at a speed of 15 mph in still water and returns
jek_recluse [69]

Answer:

Speed of river's current = 5 mph

Step-by-step explanation:

Let 'd' be the distance covered  

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Speed upstream = 15-x

speed downstream = 15+x

Time = distance / speed

time upstream = \frac{d}{15-x}

time downstream = \frac{d}{15+x}

the ferry trip upstream takes twice as long as its return trip downstream

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divide both sides by d

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cross multiply

15+x= 2(15-x)

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subtract 15 from both sides and divide by 3

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x=5

Speed of river's current = 5 mph

8 0
3 years ago
2. What step did Mikayla do wrong when she solved this
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