The compound represented below has the formula Na2S. 
Definitions:
Success
The achievement of a set goal or objective, often measured by criteria set by individuals or organizations.
Seed Density
The number of seeds per unit area or volume, which can affect plant growth and crop yield.
Lawn Quality
A measure of the health, appearance, and overall condition of a grassy area or garden.
Prediction Interval
A prediction interval is a range of values that is used to estimate the interval within which a future observation will fall, with a certain degree of confidence, based on current data.
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Q113: Calculate the year 2000 simple price index