According to the American Red Cross, 10% of all Connecticut residents have Type B blood. A random sample of 20 Connecticut residents is taken. X=X=the number of CT residents that have Type B blood, of the 20 sampled. What is the standard deviation of the random variable XX?

• 1.572081.57208
• 1.87951.8795
• 1.538881.53888
• 1.522221.52222
• 1.81.8
• 2.09678