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raketka [301]
3 years ago
14

I'm stuck and don't know what to do

Mathematics
1 answer:
Ratling [72]3 years ago
7 0
the answer is x=6.25 i hoped i helped
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Geometry question please help!
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Answer:

4

Step-by-step explanation:

Since,

The width of the Longer gear is 7, and the smaller gear has a width of 3..

7-3 = 4

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What do the following two equations represent?
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Answer:

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3 years ago
Which property justifies this statement?
Katen [24]
I know its not division,addition,multiplication,with the process of elimination its reflexive

5 0
3 years ago
Read 2 more answers
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
In a class of 25 students, 24 of them took an exam in class and 1 student took a make-up exam the following day. The professor g
gavmur [86]

Answer:

The  value is   \mu_n  =  73.6

Step-by-step explanation:

From the question we are told that

   The total number of students is  N =  25

    The  number of student that took exam in class is  n  = 24

    The number that took make up exam is  k  =  1

     The  average score of the first 24 students is  \mu  =  74

       The  standard deviation is \sigma  =  8.9

      The  average score of the student who took make up test is \= x  =  64

Generally the new average is mathematically represented as

      \mu_n  =  \frac{( n * \mu ) +  \= x }{N}

      \mu_n  =  \frac{( 24 * 74 ) +  64 }{25}

       \mu_n  =  73.6

7 0
3 years ago
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