A tyre manufacturer wants to measure the inner dimension (in millimetres) of a particular type of a tyre. A sample of 9 tyres is selected and ranked from smallest to largest as follows:

569 570 571 573 574 578 581 582 587

The mean inner dimension ismillimetres (1 decimal place)

2) If the first and the last values of the diameter were 545 and 587 respectively instead of 569 and 587, state the shape of the distribution. Type LS (left skewed), RS (right skewed), SY (symmetric) as appropriate.