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ExtremeBDS [4]
3 years ago
11

$115. Today, the price rose to $161. Find the percentage increase. $ ?

Mathematics
1 answer:
Svetllana [295]3 years ago
3 0

Answer:

40%

Step-by-step explanation:

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Suppose you are the manager of Speedy Oil Change which claims that it will change the oil in​ customers’ cars in less than 30 mi
Veronika [31]

Answer:

Explained below.

Step-by-step explanation:

(1)

The hypothesis can be defined as follows:

<em>H</em>₀: The Speedy Oil Change will change the oil in​ customers’ cars in more than 30 minutes on average, i.e. <em>μ</em> > 30.

<em>H</em>ₐ: The Speedy Oil Change will change the oil in​ customers’ cars in less than 30 minutes on average, i.e. <em>μ</em> ≤ 30.

(2)

Use Excel to compute the sample mean and standard deviation as follows:

\bar x=\text{AVERAGE(array)}=24.917\\\\s=\text{STDEV.S(array)}=8.683

Compute the test statistic as follows:

t=\frac{\bar x-\mu}{s/\sqrt{n}}=\frac{24.917-30}{8.683/\sqrt{36}}=-3.51

The degrees of freedom is:

df = n - 1

   = 36 - 1

   = 35

Compute the p-value as follows:

p-value=P(t_{35}

(3)

The <em>p</em>-value = 0.0006 is very small.

The null hypothesis will be rejected at any of the commonly used significance level.

(4)

There is sufficient evidence to support the claim that the Speedy Oil Change will change the oil in​ customers’ cars in less than 30 minutes on average.

3 0
3 years ago
Write the number below as a fraction in its simplest form 0.673 the 7 and 3 are recurring
wlad13 [49]
Let x=0.6737373...(1)
10x=6.737373...(2)
1000 x=673.737373...(3)
(3)-(2) gives 
990x=667
x=667/990
7 0
3 years ago
How many ounces are in 2 pounds
Mamont248 [21]

Answer:

1. 32 ounces

2. 3 pounds

Step-by-step explanation:

1. There are 16 ounces in a pound, so you multiply 2 by 16.

2. Divide 48 by 16.

4 0
3 years ago
A worker gets $9/hr for a regular work day and $13.50/hr for additional hours. If he was paid $114.75 for an 11hr work day, how
Anika [276]

1. I did 9x8 since you usually work 8 hours a day but did not give answer, so I add or subtracted 0.5 to 8.

2. i did 9*7.5=67.5 , keep in mind that he worked for 11 hrs that day so 11-7.5=3.5 hours left

3. then I subtracted 67.5 from 114.75 and got 47.25

4. I divided 3.5 by 47.25 and got 13.5

4 0
3 years ago
Which is greater 2 miles or 3526 yards
Veronika [31]
It would  be 3526 yards since there are 1760 yards in each mile so then in just 2 miles there would be 3520 yards, which is close to 3526. Hope this helps! :D
8 0
3 years ago
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