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3 years ago

5 divided by 9.75, 0.5 divided by 4.25, 38.5 divided by 0.5.

Mathematics

2 answers:

melamori03 [73]3 years ago

8 0

Answer:

0.5128

0.1176

Step-by-step explanation:

OLga [1]3 years ago

3 0

Answer:

1. 1.95

2. 8.5

3. 77

Step-by-step explanation:

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Whats the percent change of 13.7 to 40.2

k0ka [10]

The percent change of 13.7 to 40.2 is 193.4%

To find percentage change, you need to find the difference between the two numbers. In this case, 26.5.

You then divide 26.5 by 13.7 and move the decimal point two spaces to the right.

6 0

3 years ago

Read 2 more answers

Please help times running out

denpristay [2]

Answer: c

Step-by-step explanation:

6 0

3 years ago

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

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.

So, a 98% confidence interval for the population mean, $\mu$ is;

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

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

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

= [21.34, 26.49]

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

7 0

2 years ago

PLS HELP GIVING BRAINLIEST TO THE ANSWER!!!! Triangle ABC, in the coordinate plane, is reflected over the x-axis to form AA'B'C'

jasenka [17]

Answer:

The 3rd answer

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

△ABC = △DBC, AB= 10, AC=7 DC= ?

Furkat [3]

Answer:DC=7

Step-by-step explanation:

As it is written △ABC = △DBC. So the corresonding legs (the legs which are equal ) are as follows:

AC=DC AB=DB BC= BC

So DC=7 the same like AC

7 0

3 years ago