The National Coffee Drinking Trends is “the publication” in the coffee industry. For more than five decades, it has tracked annual consumption patterns in a wide variety of situations and categories.

The 2004 edition says that 39% of the total coffee drinkers 18 years and older purchased shade-grown coffee in 2004.

Source: http://www.ncausa.org/public/pages/index

.cfm?pageid=38 If this percentage is true for coffee drinkers at Crimson Light’s coffeehouse, what is the probability of the following for the next 50 customers purchasing coffee at Crimson Light’s:

a. More than 20 have purchased a shade-grown variety.

b. Fewer than 15 have purchased a shade-grown variety.