3 years ago

Giving away points, because I'm leaving :3

Mathematics

1 answer:

VLD [36.1K]3 years ago

3 0

Answer: Thank you very much!

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James has 6 stamps in his stamp collection. Roy has 12 stamps in his stamp collection. James adds 2 stamps to his stamp collecti

Phoenix [80]

For every one stamp James has Roy has twice as much. So the ratio would be 1/2

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3 years ago

Hii my other account got banned and it sucks so now can I plz get a boy

Taya2010 [7]

... why would you say that on brainly....

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3 years ago

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A random sample of 31 charge sales showed a sample standard deviation of $50. a 90% confidence interval estimate of the populati

Marysya12 [62]

The $100(1-\alpha)\%$ confidence interval of a standard deviation is given by:

$\sqrt{ \frac{(n-1)s^2}{\chi^2_{1- \frac{\alpha}{2} } }} \leq\sigma\leq\sqrt{ \frac{(n-1)s^2}{\chi^2_{\frac{\alpha}{2} } }}$

Given a sample size of 31 charge sales, the degree of freedom is 30 and for 90% confidence interval,

$\chi^2_{1- \frac{\alpha}{2} }=43.773 \\ \\ \chi^2_{\frac{\alpha}{2} }=18.493$

Therefore, the 90% confidence interval for the standard deviation is given by

$\sqrt{ \frac{(31-1)50^2}{43.773 }} \leq\sigma\leq\sqrt{ \frac{(31-1)50^2}{18.493 }} \\ \\ \Rightarrow\sqrt{ \frac{(30)2500}{43.773 }} \leq\sigma\leq\sqrt{ \frac{(30)2500}{18.493 }} \\ \\ \Rightarrow\sqrt{ \frac{75000}{43.773 }} \leq\sigma\leq\sqrt{ \frac{75000}{18.493 }} \\ \\ \Rightarrow \sqrt{1713.38} \leq\sigma\leq \sqrt{4055.59} \\ \\ \Rightarrow41.4\leq\sigma\leq63.7$

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3 years ago

A library expansion begun in 2002, was expected to cost $107 million. By 2006 library officials estimated the cost would be $34

Alla [95]

This problem is quite easy if you didregard the years. Percent increase is known as
(Final-initial)/(Final)
In this case final would be 107 million +34 million=141 million. Initial would be 107 million.

(142-107)/142=37/142 which is around 26%.

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3 years ago

How many individual pieces of cheese, each weighing 1/4 Ib, can be cut from a block of cheese weighing 5 pounds?

Zanzabum

It would be 20, because 0.25 goes into 5 20 times.

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3 years ago

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