3 There are 40 students in a college statistics class. After the first exam, their instructor told Select one answer. them that the class scores were normally distributed with a mean of 76.9 and a standard 10 points deviation of 3.2. However, one of the students pointed out that the instructor recorded 28 for his score when he actually earned 82. The class recalculates the mean and standard deviation. The mean is now 78.1. Which of the following is true about the standard deviation? A. O The standard deviation will increase because the value of an exam score increased. B. O The standard deviation will stay the same because it is not affected by a change in a single data value. C. O The standard deviation will decrease because the change moved an exam score closer to the mean