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3 years ago

Add 8 mins 32 sec + 37 min 18 sec+ 15 sec

Mathematics

2 answers:

vodomira [7]3 years ago

8 0

Answer:

The solution is 46 minutes and 5 seconds

Step-by-step explanation:

we need to add the time: 8 mins 32 sec + 37 min 18 sec+ 15 sec

To sum up the time, we add mins together and seconds together,

For minutes: 8 + 37=45 minutes

For seconds : 32 + 18 + 15 =65 seconds

Since, 1 min = 60 seconds

so, we break 60 seconds as 60 + 5 seconds in which 60 sec=1 min

Then , 65 seconds =1 min and 5 seconds

Now Sum 45 minutes + 1 min and 5 seconds = 46 minutes and 5 seconds

Therefore, the solution is 46 minutes and 5 seconds

Karo-lina-s [1.5K]3 years ago

7 0

Start with minutes
8+37=45 minutes

Mow seconds
32+18=50+15=1 min 5 sec

now combine
45min+1min5sec=46 minutes and 5 seconds

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Answer:

We conclude that deluxe tire averages less than 50,000 miles before it needs to be replaced which means that the claim is not supported.

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We are given that a particular brand of tires claims that its deluxe tire averages at least 50,000 miles before it needs to be replaced. From past studies of this tire, the standard deviation is known to be 8000.

From the 28 tires surveyed, the mean lifespan was 46,500 miles with a standard deviation of 9800 miles.

Let $\mu$ = average miles for deluxe tires

So, Null Hypothesis, $H_0$ : $\mu \geq$ 50,000 miles {means that deluxe tire averages at least 50,000 miles before it needs to be replaced}

Alternate Hypothesis, $H_A$ : $\mu$ < 50,000 miles {means that deluxe tire averages less than 50,000 miles before it needs to be replaced}

The test statistics that will be used here is One-sample z test statistics as we know about population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, $\bar X$ = sample mean lifespan = 46,500 miles

$\sigma$ = population standard deviation = 8000 miles

n = sample of tires = 28

So, test statistics = $\frac{46,500-50,000}{\frac{8000}{\sqrt{28} } }$

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The value of the test statistics is -2.315.

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Therefore, we conclude that deluxe tire averages less than 50,000 miles before it needs to be replaced which means that the claim is not supported.

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