Suppose we wish to calculate a 95% confidence interval for the average amount spent on books by freshmen in their first year at a major university. The interval is to have a margin of error of $3. Assume that the amount spent on books by freshmen has a Normal distribution with a population standard deviation o is $30. How many observations are required to achieve this margin of error? 19 20 384 385

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A: We want to calculate ϕ(41)

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A: I used trigonometric functions identities

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A: Let's find.

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A: Given f(x) = 4x - 3 g( x ) = x2 + 4 h( x ) = x + 5

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A:

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A:

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A:

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A: Solution

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A:

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A: Given,        ∫45+9t+125+9t7dt

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A:

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A: Floor value of x  is given as the greatest integer that is less than or equal to x

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A:

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A:

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A:

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A:

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A:

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A:

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A: