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Professor Wilson took a sample of 220 students from her morning class and a sample of...

Professor Wilson took a sample of 220 students from her morning class and a sample of 117 students from her evening class. On Exam 1, all those sampled from the morning class got a 63 while those sampled from the evening class averaged a 69 with a variance of 162. If Professor Wilson combines these two samples

What is the combined Exam 1 standard deviation? How do I get this step by step --> Answer 8.007

math   Statistics-And-Probability   
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Answer #1

Have a look I've even calculated it on online calculator ,I got the same result .

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