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Recent content by cristiano

Mathematics: Post your doubts here!

3 A sample of 36 data values, x , gave Σ(x −45) = −148 and Σ(x −45)2=3089. (i) Find the mean and standard deviation of the 36 values. [3] (ii) One extra data value of 29 was added to the sample. Find the standard deviation of all 37 values.[4] No need to solve (i) solve (ii) only. this is a...
- cristiano
- Post #16,111
- Oct 8, 2015
- Forum: A-Levels

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