Math
Pre-Algebra - Calculus 
Easy but Analytical
The average of 5, 10, 15 and z is 20. What is z?
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3
Points
Engineering Statistics
What does meant by Class Mark in frequency distribution?
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3
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Sunny
0
0
Statistics
One sample has SS = 48 and a second sample has SS= 42 a. Assuming that n= 4 for both samples, find each of the sample variances, and calculate ... ..thank you.
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3
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