3 A sample of 36 data values, \(x\), gave \(\Sigma ( x - 45 ) = - 148\) and \(\Sigma ( x - 45 ) ^ { 2 } = 3089\).
- Find the mean and standard deviation of the 36 values.
- One extra data value of 29 was added to the sample. Find the standard deviation of all 37 values.