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A poll found that a particular group of people read an average of 15.7 books per year. The pollsters are 99% confident that the
1 answer:
<h2>Answer with explanation:</h2>
Given : A poll found that a particular group of people read an average of 15.7 books per year.
i.e.
The pollsters are 99% confident that the result from this poll is off by fewer than 2.65 books from the actual average x.
i.e. E= 2.65
The confidence interval for population mean is given by :-
Hence, the required inequality involving absolute value for :
To solve this inequality for x, we have
Hence, the interval in which the average is likely to fall :
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Answer:
Step-by-step explanation:
Surface area = lateral area + 2(area of base)
Lateral area = perimeter of base * height.
Because it is a isosceles right triangle, both sides are equal.
= 72
2 = 72. Divide both sides by 2
= 36. Square both sides.
x = 6.
So the perimeter of the base = 6 + 6 + = 20.485281374239
Lateral area = 20.485281374239 * 7 = 143.397
Area of base is (1/2)base * height.
(1/2)(6)(6) = 18
Using the surface area formula
surface area = 143.397 + 2(18) = 179.4