class average 64 (out of 100)

grades	90's	80's	70's	60's	50's	40's	30's
frequency	1	1	3	1	3	1	1

question	1	2	3	4	5	6	7	8	9	10	11	12
average	13	9	11	14	8	4	3	4	2	2	2	4
max value	15	15	15	15	15	5	5	5	5	5	5	5

(As a rule the averages in last table do not count questions left unanswered.)

Some questions (2,5 and 9-11) appear to have been more difficult and generally had lower scores.