Professor Smith took a sample of 201 students from her morning class and a sampl

Question

Professor Smith took a sample of 201 students from her morning class and a sample of 156 students from her evening class. On Exam 1, all those sampled from the morning class got a 67 while those sampled from the evenin class averaged a 64 with a variance of 131. If Professor Smith combines these two samples. Question 2 What is the combined Exam 1 average? Question 3A What is the combined Exam 1 median? Question 3BWhat is the shape of the combined Exam 1 grade distribution? Skewed Left Mound-Shaped Symmetrical Question 4 What is the combined Exam 1 standard deviation?

Explanation / Answer

Ans:

2)Combined average=(201*67+156*64)/(201+156)=65.69

3A)

3B)Symmetrical

4)std. dev=sqrt(0+131)=sqrt(131)=11.45

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