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3 years ago

15

Liz is a student in Ms. Xu's class. Liz says to her classmates, "Of all the pairs of students Ms. Xu can choose as class leaders

, I am included in one-tenth of those pairs." How many students are in Ms. Xu's class?

1 answer:

RideAnS [48]3 years ago

5 0

I think it's 20 students

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A manufacturer of banana chips would like to know whether its bag filling machine works correctly at the 402 gram setting. It is

lidiya [134]

Answer:

The value of t test statistics is -2.25.

Step-by-step explanation:

We are given that a manufacturer of banana chips would like to know whether its bag filling machine works correctly at the 402 gram setting. It is believed that the machine is under filling the bags.

A 25 bag sample had a mean of 393 grams with a standard deviation of 20.

<u><em>Let </em></u> $\mu$ <u><em> = mean filling of bags by the machine.</em></u>

So, Null Hypothesis, $H_0$ : $\mu \geq$ 402 gram {means that the the machine is not under filling the bags}

Alternate Hypothesis, $H_A$ : $\mu$ < 402 gram {means that the the machine is under filling the bags}

The test statistics that would be used here <u>One-sample t test statistics</u> as we don't know about the population standard deviation;

T.S. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample mean bag filling = 393 grams

s = sample standard deviation = 20 grams

n = sample of bags = 25

So, <u><em>test statistics</em></u> = $\frac{393-402}{\frac{20}{\sqrt{25} } }$ ~ $t_2_4$

= -2.25

The value of t test statistics is -2.25.

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3 years ago

A bag contains 3 red, 5 yellow, and 7 purple marbles. Find the probability of drawing a purple marble followed by a red marble.

jeka57 [31]

Answer:

unsimplified : $\frac{21}{225} or simplified: \: \frac{7}{75}$

Step-by-step explanation:

Work out : Look above at image.

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3 years ago

Determine whether each equation represents a proportional relationship.

likoan [24]

Answer:

Proportional Relationship: I Not a Proportional Relationship:

y=1.6x I y=3/(4x)

y=x I y=2x+1

y=12x . I y=3+x

Explanation:

I took the test and that's how i got these answers.

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Justin is considering two websites for downloading music.The costs are detailed here.

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What is the expression here.. I found the answer but i dont know the expression!! SOMEONE PLEASE HELP!!

iogann1982 [59]

Idk if this helped you

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