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nignag [31]
2 years ago
6

Find 3/7 of 21? Can you find this answer because my homework I do not know how to do so can you please find this question.

Mathematics
2 answers:
ira [324]2 years ago
6 0

Answer:

9

Step-by-step explanation:

const2013 [10]2 years ago
5 0

Answer:

9

Step-by-step explanation:

3/7 multiplied by 21 = 3/7 x 21 = 9 = 3/7 x 21/1 = 63/7 = 9

Or if you can't do the math - Think of a  pizza with 21 slices . Now cut this pizza into 7 equal parts. You will find that each part contains exactly 3 slices. Now, eat 3 of these parts. With three slices in each part, you ate 9 slices - which is three sevenths of 21.

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An automobile company wants to determine the average amount of time it takes a machine to assemble a car. A sample of 40 times y
aksik [14]

Answer:

A 98% confidence interval for the mean assembly time is [21.34, 26.49] .

Step-by-step explanation:

We are given that a sample of 40 times yielded an average time of 23.92 minutes, with a sample standard deviation of 6.72 minutes.

Firstly, the pivotal quantity for finding the confidence interval for the population mean is given by;

                               P.Q. =  \frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }  ~ t_n_-_1

where, \bar X = sample average time = 23.92 minutes

             s = sample standard deviation = 6.72 minutes

             n = sample of times = 40

             \mu = population mean assembly time

<em> Here for constructing a 98% confidence interval we have used a One-sample t-test statistics because we don't know about population standard deviation. </em>

<u>So, a 98% confidence interval for the population mean, </u>\mu<u> is; </u>

P(-2.426 < t_3_9 < 2.426) = 0.98  {As the critical value of z at 1%  level

                                               of significance are -2.426 & 2.426}  

P(-2.426 < \frac{\bar X-\mu}{\frac{s}{\sqrt{n} } } < 2.426) = 0.98

P( -2.426 \times {\frac{s}{\sqrt{n} } } < {\bar X-\mu} < 2.426 \times {\frac{s}{\sqrt{n} } } ) = 0.98

P( \bar X-2.426 \times {\frac{s}{\sqrt{n} } } < \mu < \bar X+2.426 \times {\frac{s}{\sqrt{n} } } ) = 0.98

<u>98% confidence interval for</u> \mu = [ \bar X-2.426 \times {\frac{s}{\sqrt{n} } } , \bar X+2.426 \times {\frac{s}{\sqrt{n} } } ]

                                     = [ 23.92-2.426 \times {\frac{6.72}{\sqrt{40} } } , 23.92+2.426 \times {\frac{6.72}{\sqrt{40} } } ]  

                                    = [21.34, 26.49]

Therefore, a 98% confidence interval for the mean assembly time is [21.34, 26.49] .

7 0
3 years ago
Please help me and take a picture and show your work​
Alona [7]

Answer:

48

Step-by-step explanation:

The rule is every parent means 8 students.

6 * 8 is 48.

3 0
2 years ago
If p is inversely proportional to the square of q, and p is 28 when q is 3, determine p when q is equal to 2.
lianna [129]

Answer:63

Step-by-step explanation:

4 0
3 years ago
Solve for x: <br> (x+4)/2=7<br><br> * (x+4)/2 is a fraction *
blondinia [14]

Answer:

x=10

Step-by-step explanation:

So, we got our equation:

\frac{x+4}{2}=y

We'll multiply both sides by 2 to get rid of that fraction.

x+4=14

Then, we just subtract 4 from both sides.

x=10

6 0
3 years ago
Solution of 4/5 + 2/3
xxMikexx [17]

Answer:

\frac{22}{15}

Step-by-step explanation:

\frac{4}{5}+\frac{2}{3}

Adjust based on LCM (15):

=\frac{12}{15}+\frac{10}{15}

=\frac{12+10}{15}

=\frac{22}{15}

8 0
3 years ago
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