Here

I’ve started using LaTeX regularly.

I’m using Texmaker. Some other options are discussed here, here, and here.

Good resources on using LaTeX are here and here.

Sample templates are here and here.

Here

You can find it here.

I can’t find good references to directly support the common claim that 80% of California water is used by agriculture. But I could find numbers on 2010 consumption. As shown below, irrigation accounts for 60.7% of water usage (this includes more than agriculture). It seems 80% figure comes from subtracting out water reserved for environmental uses.

2010 Figures:
mgpd = million gallons per day
Total = 38 billion gallons per day = 13,870 billion gallons per year
Irrigation (crop, pasture, recreational lands such as parks, golf courses) 60.7% (23,056 mgpd)
Thermoelectric power generation (equipment cooling) 17.4% (6,601 mgpd)
Public supply (domestic, commercial, industrial, pools, parks, firefighting) 16.6% (6,307 mgpd)

From California Wikipedia article
California GDP (2012) = $1.959 trillion
California agriculture production = $46.7 billion (2013) (~2.4% of California economic output).
California population (2014) = 38.8 Million

Upshot of this is ~2.4% of California economic output consumes more than half of California water.

I’m having trouble finding water use by agriculture commodity, but it’s easy to find agriculture economic output by commodity.
Milk $6.9B
Grapes $4.4B
Almonds $4.3B
Nursery plants $3.5B
Cattle, Calves $3.2B
Strawberries $1.9B
Lettuce $1.4B
Walnuts $1.3B
Hay $1.2B
Tomatoes $1.17B

Interesting blog on California water

Khan Academy has good resources on probability and statistics.

These are particularly interesting crib notes for image sensors:
Standard error of the mean
Basic definitions
Alternate variance formulations
Box and whisker plots

These are more generally interesting:
Regression, Least squares error
Law of large numbers
Binomial distribution
Poission process