CRACK THE CODE - 5 LOCK PROBLEMS

NOTE - ERROR on YR 11 GEN PROBABILITY FIXED 15/6/2013.Five Lock Problems that I put together after seeing the idea from Chris Smith (check out his resources on TES - inspirational ideas) Covering Rates & Ratios aimed at lower ability 14 year old, basic Probability é Counting Techniques aimed at middle ability 15 to 17 year olds, one for a seminar for higher level 17 yr old, but I didn't know their ability level, Basic Probability for lower ability 15 yr olds é basic statistics for lower ability 15 yr olds.