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3 years ago

Can someone please help me

Mathematics

1 answer:

Katen [24]3 years ago

4 0

8. 0, 12,-45,-156.

9.

A. -27
B. -27,-19,-13,-5,4,0
C. 0

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allsm [11]

Answer:

7/16

Step-by-step explanation:

1. you have to have the same denominator

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3 years ago

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Need help with b and c

xz_007 [3.2K]

Answer:

Step-by-step explanation:

the formula is:

$a_n = \frac{n+1}{n+2}$

[tex]a_100 = \frac{101}{103}[\tex]

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What is the length of segment AB? Consider the diagram. 7,9,18,25

Mrrafil [7]

Answer:

Step-by-step explanation:

It is congruent to the other side.

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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] .

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3 years ago

A cube has a side length of 6 cm. What is the volume of the cube, in cubic centimeters

Lady_Fox [76]

Answer:

V=216cm³

Step-by-step explanation:

V=216cm³

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3 years ago