vanquic. Left-handedness Roughly 10% of all college students in the United States are left-handed. Most academic institutions try to have at least a few left-handed chairs in each classroom. 225 students are about to enter a lecture hall that has 30 left-handed chairs for a lecture. What is the probability that this is not going to be enough; in other words, what is the probability that more than 30 (or at least 31) of the 225 students are left-handed? 1. How should you write the initial probability? P( I 2. Based on on our "rule of thumb", is the normal approximation appropriate? np = and nq = 3. What is the continuity of correction? P(r 30.5 ) ( click to view hint ) 4. What is the mean? u = (Click to view hint) 5. What is the standard deviation? (Click to view hint) 6. What is the z-score? z = (Click to view hint) 7. What is the probability that more than 30 students are left-handed? Normal Table (opens in a new window) The probability that more than 30 students are left handed is Check