1 Every day, George attempts the quiz in a national newspaper. The quiz always consists of 7 questions. In the first 25 days of January, the numbers of questions George answers correctly each day are summarised in the table below.
| Number correct | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
| Frequency | 1 | 2 | 3 | 3 | 4 | 7 | 5 |
- Draw a vertical line chart to illustrate the data.
- State the type of skewness shown by your diagram.
- Calculate the mean and the mean squared deviation of the data.
- How many correct answers would George need to average over the next 6 days if he is to achieve an average of 5 correct answers for all 31 days of January?