- Each of the 25 students on a computer course recorded the number of minutes \(x\), to the nearest minute, spent surfing the internet during a given day. The results are summarised below.
$$\Sigma x = 1075 , \Sigma x ^ { 2 } = 44625 .$$
- Find \(\mu\) and \(\sigma\) for these data.
Two other students surfed the internet on the same day for 35 and 51 minutes respectively.
- Without further calculation, explain the effect on the mean of including these two students.
(2)