3 years ago

PLZ HELP WILL GIVE BRAINLIEST

Mathematics

1 answer:

VMariaS [17]3 years ago

8 0

Answer: I think is 90 I’m not sure see others answer

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Nina can braid 48 inches of rope in 1 hour. what is her speed in feet per hour?

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3 years ago

How many many times 144 goes in to 12

iren [92.7K]

Answer:

12 times

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Felipe rented a truck for one day. There was a base fee of $16.95, and there was an additional charge of 76 cents for each mile

adelina 88 [10]

Answer:Fee as a function of miles:

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An SRS of 450 450 high school seniors gained an average of ¯ x = 20 x¯=20 points in their second attempt at the SAT Mathematics

maria [59]

Answer: (15.47, 24.53)

Step-by-step explanation:

We know that the confidence interval for population mean is given by :_

$\overline{x}\pm z^*\dfrac{\sigma}{\sqrt{n}}$

, where n= sample size.

$\sigma$ = standard deviation.

$\overline{x}$ = sample mean.

z*= Critical value.

Given : n= 450

$\overline{x}=20$

$\sigma=49$

Critical value for 95% confidence = z*=1.96 [From z-value table]

Then, the 95% confidence interval will be :-

$20\pm (1.96)\dfrac{49}{\sqrt{450}}$

$\approx 20\pm (1.96)(2.31)$

$\approx 20\pm 4.53$

$=(20-4.53,\ 20+4.53)=(15.47,\ 24.53)$

Hence, the 95% confidence interval for the mean change in score μ μ in the population of all high school seniors. : (15.47, 24.53)

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3 years ago