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Question: How do you solve normal distribution problems?

I’m having trouble setting up this word problem. Will someone please help me and show me how to set this problem up/or how to solve it? I have a test in two weeks and I have no idea how to solve normal distributions. I’m taking online classes and my professor isn’t very responsive when it comes to emailing questions! Thanks

The average charitable contribution itemized per income tax return in Pennsylvania is $792. Suppose that the distribution of contributions is normal with a standard deviation of $103. Find the limits for the middle 50% of contributions.
How did you find the z-score?

Answer: I assume that you have a normal distribution table available to you in your course. Using this table, find the z-scores corresponding to an area under the normal curve of 0.7500 and 0.2500. Multiply these z-scores by $103 and then add $792 to convert the z-scores into the contribution amounts.

Baidu Announces Third Quarter 2010 Results

BEIJING , Oct. 21 , /PRNewswire-Asia/ — Baidu, Inc. (NASDAQ: BIDU), the leading Chinese language Internet search provider, today announced its unaudited financial results for the third quarter ended September 30, 2010 . Third Quarter 2010 Highlights — Total revenues in the third quarter of 2010 were RMB2.256 billion ($337.2 million), a 76.4% increase from the corresponding period in 2009 …

Basic Income Tax – Part 12

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