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2 years ago

if Amanda hikes at an average speed of 2.72 miles per hour, how long will it take her to hike 6.8 miles

2 answers:

7 0

It will take Amanda 2 hours and 30 minutes because 2.72 is an hour and 1.36 is half an hour (30 minutes) so if you multiply 2.72 by 2 you get 5.44 then you add 1.36 and you will end up with 6.80 so the answer is 2 hours and 30 minutes.

kompoz [17]2 years ago

3 0

Speed times time=distance
distance=6.8
speed=2.72
time=?

2.72 times ?=6.8
divide both sides by 2.72
?=2.5

answer si 2.5 hours

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2 years ago

Find the compound interest on 800 at 5% per annum for 2 years.

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Answer:

$C = 82$

Step-by-step explanation:

Given

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$N = 2$ -- Time

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$A = P(1 + R)^N$

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2 years ago

Suppose 52% of the population has a college degree. If a random sample of size 563563 is selected, what is the probability that

amm1812

Answer:

The value is $P(| \^ p - p| < 0.05 ) = 0.9822$

Step-by-step explanation:

From the question we are told that

The population proportion is $p = 0.52$

The sample size is n = 563

Generally the population mean of the sampling distribution is mathematically represented as

$\mu_{x} = p = 0.52$

Generally the standard deviation of the sampling distribution is mathematically evaluated as

$\sigma = \sqrt{\frac{ p(1- p)}{n} }$

=> $\sigma = \sqrt{\frac{ 0.52 (1- 0.52 )}{563} }$

=> $\sigma = 0.02106$

Generally the probability that the proportion of persons with a college degree will differ from the population proportion by less than 5% is mathematically represented as

$P(| \^ p - p| < 0.05 ) = P( - (0.05 - 0.52 ) < \^ p < (0.05 + 0.52 ))$

Here $\^ p$ is the sample proportion of persons with a college degree.

$P( - (0.05 - 0.52 ) < \^ p < (0.05 + 0.52 )) = P(\frac{[[0.05 -0.52]]- 0.52}{0.02106} < \frac{[\^p - p] - p}{\sigma } < \frac{[[0.05 -0.52]] + 0.52}{0.02106} )$