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3 years ago

11

The ticket price, t, for a concert attended by 220 people equals the total revenue, r, divided by the number of people who atten

ded.

2 answers:

lianna [129]3 years ago

7 0

I'm not entirely sure what you are asking but the equation would be r/220=t.

FinnZ [79.3K]3 years ago

4 0

Answer: The correct answer is (A.

Step-by-step explanation: T= R/220

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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

I have $25 all in nickels and dimes. There are twice as many Nickles as dimes. How many of each are there?

Mama L [17]

Answer:

N=250

Step-by-step explanation:

"twice as many nickels as dimes" means N =2D [eq1]

"collection of nickels and dimes is worth $25" means

5N + 10D = 2500 [eq2]

(To avoid using decimal points, PLZ express everything in cents.)

Substitution (substitute N from eq1 into eq2]:

5(2D) + 10D = 2500

10D + 10D = 2500

20D = 2500

D = 125

N=2D [eq1 again]

N=2(125)

N=250

Check:

Is 5(250) + 10(125) = 2500 ?

1250 + 1250 = 2500 ?

2500 = 2500 ?yes

7 0

3 years ago

This is a number system which uses a base of 10. The valid digits are 0 to 9.

Licemer1 [7]

I think it's 9 but I could be wrong

7 0

3 years ago

Read 2 more answers

You are planning a movie marathon. Each movie lasts 3/2 hours. You want to watch 4 movies nonstop. How many hours will your movi

Citrus2011 [14]

Answer:

Your movie marathon will last 6 hours.

Step-by-step explanation:

This question can be solved using a rule of three.

Each movie lasts $\frac{3}{2} = 1.5$ hours. How much do 4 movies last?

So

1 movie - 1.5 hours

4 movies - x hours

x = 4*1.5 = 6

Your movie marathon will last 6 hours.

5 0

3 years ago

Which set of parametric equations over the interval 0 ≤ t ≤ 1 defines a line segment with initial point (–5, 3) and terminal poi

Strike441 [17]

Answer:

x(t) = –5 + 6t; y(t) = 3 – 9t

Step-by-step explanation:

6 0

3 years ago