MHB Estimating the Probability of Earning a Certain Amount in a Weekend as a Waiter

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The waiter estimates his tips follow a left-skewed distribution with a mean of $8.20 and a standard deviation of $5.60, serving around 60 parties per weekend. The probability of earning at least $600 was calculated to be 0.0064. For the best 1% of weekends, the discussion focuses on finding the corresponding z-score using the z-scale. The user successfully identified that to find the z-score, they need to look for the value that corresponds to the 99th percentile. Understanding these calculations is essential for estimating potential earnings accurately.
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A waiter believes the distribution of his tips has a model that is slightly skewed to the left, with a mean of $\$8.20$ and a standard deviation of ​$\$5.60$. He usually waits on about 60 parties over a weekend of work. ​a) Estimate the probability that he will earn at least ​$\$600$. ​b) How much does he earn on the best 1​% of such​ weekends?

I worked out A and got 0.0064. I am having an issue on B. I don't understand how you obtain z​.
 
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I have figured out on my own. 1-00.1= .99 find it on the z-scale!
 

Thread 'Area of Overlapping Squares'

Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?
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