J. {Binomial Random 1Variable}: About 15% of adults in US use their left hand in writing. Suppose that you randomly,r select ED adults for your research and assume that no one uses both hands in writing [3 points] J1. What is the expected number of adults who use their left hands in your research? J2. 'What is the standard deviation for the number of adults who use their left hands in your research? J3. What is the probability that 4 adults in your research turn out to use their left hands in writing