# Category Archives: S2 statistics

# Y13 Further Maths homework for 21 March

# Plan for S2 statistics, November 2017 to January 2018

# S2 statistics past papers, and other S2 materials

# “Part A” homework for Y13 Further Maths for 6 Dec 2017

# Answer to STEP I 2008 Q.12

Finding expected value and median. Continue reading

# Answer to STEP I 2013 Q.13

From the integers 1, 2, … 52, I choose seven (distinct) integers at random, all choices being equally likely. From these seven, I discard any pair that sum to 53. Let X be the random variable the value of which is the number of discarded pairs. Find the probability distribution of X and show that E(X) = 7 / 17 Continue reading