### Pattern Recognition

When does a pattern start to exhibit structure? Can you crack the code used by the computer?

### Reaction Timer Timer

How can you time the reaction timer?

# Time to Evolve 2

##### Stage: 5 Challenge Level:

What are the formulae for the expectation of a sum and the variance of a sum?

In creating the trial simulation, you could use the spreadsheet functions

RAND() returns a $\mbox{U}[0,1]$ random variable.

COUNTIF($A$5:$A$1005,"=96") counts the number of cells in the range$A$5:$A$1005 which equal the value 96