3. A teacher wants to evaluate how fast her 8th grade students are able to type. She has them all take the same typing speed test and finds that the average speed is 15 words per minute, with a standard deviation of 4 words per minute. She makes a histogram of the speeds, and this approximately follows the normal curve. Use the normal approximation to nd the percentage of her students who type between 10 and 20 words per minute. 4. Among the students who took STAT 2 one semester, the average midterm score was about 34, the SD was about 5, and the highest score was 90. Did the midterm scores follow the normal curve? Explain briefly