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3 years ago

School Math. Homework.

Mathematics

1 answer:

kupik [55]3 years ago

6 0

Assuming the worker continues to work at the same rate, they would finish in 25 hours. Dividing 200 by 8 will give us 25.

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In a random sample of 30 people who rode a roller coaster one day, the mean wait time is 46.7 minutes with a standard deviation

Rainbow [258]

Answer: C. $(29,\ 37.8)$

Step-by-step explanation:

The confidence interval for difference of two population mean is given by :-

$\overline{x}_1-\overline{x}_2\pm z_{\alpha/2}\sqrt{\dfrac{s_1^2}{n_1}+\dfrac{s_2^2}{n_2}}$

Given : Level of significance : $1-\alpha:0.99$

Then , significance level : $\alpha: 1-0.99=0.01$

Critical value : $z_{\alpha/2}=z_{0.005}=2.576$

$n_1=30\ ;\ n_2=50\\\\\overline{x}_1=46.7\ ;\ \overline{x}_2=13.3\\\\s_1=9.2\ ;\ s_2=1.9$

$46.7-13.3\pm(2.576)\sqrt{\dfrac{9.2^2}{30}+\dfrac{1.9^2}{50}}\approx33.4\pm4.38=(29.02\ ,37.78)\approx(29,\ 37.8)$

Hence, a 99% confidence interval for the difference between the mean wait times of everyone who rode both rides $(29,\ 37.8)$

5 0

4 years ago

Please help i will mark brainlist

posledela

Answer:196.8

Step-by-step explanation:brainlyest plz plz I need it for my rank

4 0

3 years ago

Read 2 more answers

ASP plz Look at the function y=2x=1 Dom f=(-2,-1,0,1,2)cR. Represent in a graph and find the Im f. Plz graphing it

astra-53 [7]

Answer:

Step-by-step explanation:

What is "the lm f."?

do you mean y = 2x+1?

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3 years ago

What gives the range of the function y=|x-1|+7

riadik2000 [5.3K]

The rage of the function is x=-6

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4 years ago

Can someone please help me with writing a flowchart proof?

Keith_Richards [23]

Answer:

∠AZ = ∠BX

The two triangles are equivalent triangles

Step-by-step explanation:

Flowchart proofs are organized with boxes and arrows. The statements given are written in the box and the reason of that statement is written just below the box. Every statement if flowchart proof complements other statement.

∠AZ = ∠BX

The two triangles are equivalent triangles.

5 0

3 years ago