9709 P61 - Nov 2010 - Q1
2534
Anita made observations of the maximum temperature, \(t\) °C, on 50 days. Her results are summarised by \(\Sigma t = 910\) and \(\Sigma (t - \bar{t})^2 = 876\), where \(\bar{t}\) denotes the mean of the 50 observations. Calculate \(\bar{t}\) and the standard deviation of the observations.
