Caisha has a circular garden with a radius of 4 ft. She needs to put a layer of soil on top. Each bag of soil covers 9. 42 squar
1 answer:
She needs to buy 6 bags of soil. the correct option is B
Given
Caisha has a circular garden with a radius of 4 ft.
She needs to put a layer of soil on top. e
Each bag of soil covers 9.42 square feet.
<h3>What is the radius of a circular garden?</h3>The radius of the circular garden is equal to the pie times of the square of the radius.
The radius of the circular garden is;
Therefore,
The number of bags of soil will she need to buy is;
Hence, she needs to buy 6 bags of soil.
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Answer:
So the answer for this case would be n=1337 rounded up to the nearest integer
Step-by-step explanation:
Previous concepts
A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".
The margin of error is the range of values below and above the sample statistic in a confidence interval.
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
represent the sample mean for the sample
population mean (variable of interest)
represent the population standard deviation
n represent the sample size
Solution to the problem
The margin of error is given by this formula:
(a)
And on this case we have that ME =0.07 and we are interested in order to find the value of n, if we solve n from equation (a) we got:
(b)
The critical value for 98% of confidence interval now can be founded using the normal distribution. And in excel we can use this formula to find it:"=-NORM.INV(0.01;0;1)", and we got , replacing into formula (b) we got:
So the answer for this case would be n=1337 rounded up to the nearest integer