Professor Smith took a sample of 185 students from her morning class and a sample of 147 students from her evening class. On Exam 1, all those sampled from the morning class got a 68 while those sampled from the evening class averaged a 70.2 with a variance of 125.5. If professor Smith combines these two samples…
1. What is the combined Exam 1 average (I got 68.9740)
2. What is the combined Exam 1 median? What is the shape of the combined Exam 1 grade distribution? (I don t understand how to find median with no data points)
3. What is the combined standard deviation?