0526/06

1. Difficult - I don't understand what the difference is between "arithmetic average" and the expectation. They are essentially the same thing, are they not?
2. Reflective - 12.6.1 is pretty intuitive. It makes sense that the larger the sample the more reliable the expectation as it is "harder" for big samples to be wrong (there are more individual factors that need to be wrong... it is less likely that 10 pieces of data are all off than, 5 for example).