Nyse Number Of Trading Days 2011

trading days
(Trading day) In business, the trading day is the time span that a particular stock exchange is open. For example, the New York Stock Exchange is, as of 2008, open from 9:30 AM Eastern Time to 4:00 PM Eastern Time. Trading days never take place on weekends.

number of
should be replaced with a quantitative statement, such as some, many or most.
Number of should be followed by a plural noun: a number of options.

nyse
New York Stock Exchange
(NYSED) The New York State Education Department (NYSED) is the state education department in New York. It is part of the University of the State of New York (USNY), one of the most complete, interconnected systems of educational services in the United States.
for 10 months, the NYSE had to close early to allow member firms to process trades due to a 'paperwork crisis' resulting from a lack of back-office automation^VII
New York Stock Exchange: a stock exchange in New York

2011
2011 (MMXI) will be a common year starting on a Saturday. In the Gregorian calendar, it will be the 2011th year of the Common Era, or of Anno Domini; the 11th year of the 3rd millennium and of the 21st century; and the 2nd of the 2010s decade.