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# According to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction.

According to a 2010 study conducted by the Toronto-based social media analytics firm Sysomos, 71% of all tweets get no reaction. That is, these are tweets that are not replied to or retweeted (Sysomos website, January 5, 2015). Suppose we randomly select 100 tweets.

**a. **What is the expected number of these tweets with no reaction (to the nearest whole number)?

**b. **What are the variance (to 2 decimals) and standard deviation (to 4 decimals) for the number of these tweets with no reaction?