Mathematics Science Fair Project
How accurately the egg producers measure their eggs?

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Project Information
Title: How accurately the egg producers measure their eggs?
Subject: Mathematics / Statistics
Project Type: Descriptive
Cost: Low
Affiliation: Selah Intermediate School
Year: 2000
Description: Same grade eggs (AA) brown and white colored shell were mass weighed and circumference measured for each egg. Average differences from mean mass and circumference were calculated and tabulated for each color. Results compared to USDA sizing specifications.
Background

The US Department of Agriculture grade eggs by the interior quality of the egg and the appearance and condition of the egg shell. Eggs of any quality grade may differ in weight (size).

• U.S. Grade AA eggs have whites that are thick and firm; yolks that are high, round, and practically free from defects; and clean, unbroken shells. Grade AA and Grade A eggs are best for frying and poaching, where appearance is important.
• U.S. Grade A eggs have characteristics of Grade AA eggs except the whites are "reasonably" firm. This is the quality most often sold in stores.
• U.S. Grade B eggs have whites that may be thinner and yolks that may be wider and flatter than eggs of higher grades. The shells must be unbroken, but may show slight stains. This quality is seldom found in retail stores because they are usually used to make liquid, frozen, and dried egg products, as well as other egg-containing products.

In other countries, in particular, in European Union, eggs are graded by the hen farming method instead, e.g., from free range hens, battery cages, etc.

Chicken eggs are graded by size, for the purpose of sales. The United States Department of Agriculture sizing is based by weight per dozen. The most common US size of chicken egg is 'Large' and is the egg size commonly referred to for recipes.

The following egg masses have been calculated on the basis of the USDA sizing:

Modern Sizes (USA)
Size Mass per egg Cooking Yield
Jumbo Greater than 2.5 oz. or 71 g
Very Large or Extra-Large (XL) Greater than 2.25 oz. or 64 g 56 mL (4 tbsp
Large (L) Greater than 2 oz. or 57 g 46 mL (3.25 tbsp)
Medium (M) Greater than 1.75 oz. or 50 g 43 mL (3 tbsp)
Small (S) Greater than 1.5 oz. or 43 g
Peewee Greater than 1.25 oz. or 35 g

Source: Wikipedia (All text is available under the terms of the Creative Commons Attribution-ShareAlike License)

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