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4 years ago

Please!! I have to do this by tonight!!

Mathematics

1 answer:

Aneli [31]4 years ago

4 0

Answer:

Prob.3

Denote r: radius of circle O

Formula for calculating AOB sector:

Area = pi*r^2*angle/360

Area = pi*r^2*45/360 = 18 pi

=> r^2 = 18*360/45 = 144

=> r = 12

For prob.4, give it a try, follow the formula I gave. Good luck !

(answer : r = 6)

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3 years ago

The probability of a particular event occurring is 70%what is the probability that this event does not occur

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Answer:

30%

Step-by-step explanation:

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4 years ago

. The manager of a local small bank wants to estimate the average daily balance of all the checking accounts. Assume a random sa

MaRussiya [10]

Answer:

A 95% confidence interval estimate of the population mean (average) daily balance of all the checking accounts is $274.32 to $331.68

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Consider the provided information.

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df = n-1

df = 21-1=20

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Determine t critical value for 95% confidence interval.

0.95=1-α

α=0.05

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$CI=\bar x\pm t_c \times \frac{s}{\sqrt{n}}$

Substitute the respective values.

$CI=303\pm 2.086 \times \frac{63}{\sqrt{21}}$

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$CI=274.32\ or\ 331.68$

A 95% confidence interval estimate of the population mean (average) daily balance of all the checking accounts is $274.32 to $331.68

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