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konstantin123 [22]
3 years ago
13

The Harper family is traveling to visit friends. The distance to the friend’s house is 276.45 miles. It takes the family 5.82 ho

urs to complete the trip.
Rate is found by dividing distance by time.

What is the rate for the family’s trip in miles per hour?
Mathematics
2 answers:
Leona [35]3 years ago
8 0

Answer:

270.63

Step-by-step explanation:

hope you get it right

Valentin [98]3 years ago
3 0
270.63 I think u already have the answer but it’s ok
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An appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W. From pre
melamori03 [73]

Answer:

We conclude that a compact microwave oven consumes a mean of more than 250 W.

Step-by-step explanation:

We are given that an appliance manufacturer claims to have developed a compact microwave oven that consumes a mean of no more than 250 W with a population standard deviation of 15 W.

They take a sample of 20 microwave ovens and find that they consume a mean of 257.3 W.

Let \mu = <u><em>mean power consumption for microwave ovens.</em></u>

So, Null Hypothesis, H_0 : \mu \leq 250 W     {means that a compact microwave oven consumes a mean of no more than 250 W}

Alternate Hypothesis, H_A : \mu > 250 W     {means that a compact microwave oven consumes a mean of more than 250 W}

The test statistics that would be used here <u>One-sample z test statistics</u> as we know about the population standard deviation;

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

where, \bar X = sample mean power consumption for ovens = 257.3 W

            σ = population standard deviation = 15 W

            n = sample of microwave ovens = 20

So, <em><u>the test statistics</u></em>  =  \frac{257.3-250}{\frac{15}{\sqrt{20} } }

                                      =  2.176

The value of z test statistics is 2.176.

<u>Now, at 0.05 significance level the z table gives critical value of 1.645 for right-tailed test.</u>

Since our test statistic is more than the critical value of t as 2.176 > 1.645, so we have sufficient evidence to reject our null hypothesis as it will fall in the rejection region due to which <u>we reject our null hypothesis</u>.

Therefore, we conclude that a compact microwave oven consumes a mean of more than 250 W.

7 0
3 years ago
a chef has 5 blocks of butter. Each weights 1 pound. she cuts each block into fourths. how many 1/4 pound pieces of butter does
lianna [129]
The answer would be 20 because you have 5 blocks that are cut into 1/4. It doesn't say anything about any of the pieces disappearing or being used yet so you multiply 4*5 and then you get the answer.
8 0
3 years ago
45,621 round to the nearest thousand?
yaroslaw [1]

Answer: 46,000

Step-by-step explanation:

8 0
2 years ago
Does anyone know the answer to this question???
xxMikexx [17]

Answer:

You can solve this by having 2 different equations and setting both of them to 180 because they are supplemetnary anhles

Step-by-step explanation:

so for abc the equation= 180, then solve

then for the other angle cbd=180, then solve

7 0
2 years ago
Calculate.<br><br> <img src="https://tex.z-dn.net/?f=%5Csqrt%7B%28-4.5%29%5E%7B4%7D%7D" id="TexFormula1" title="\sqrt{(-4.5)^{4}
ElenaW [278]

Answer:

Step-by-step explanation:

\sqrt{(-4.5)^{4}}=\sqrt{(-4.5)*(-4.5)*(-4.5)*(-4.5)}\\\\= (-4.5) * (-4.5)\\\\= 20.25

5 0
3 years ago
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