Probability Stage 4 - Short Problems


This is part of our collection of Short Problems.

You may also be interested in our longer problems on Probability - Stage 4.

Descending Deal

KS 4 Short Challenge Level:

Challenge Level:1

Weekly Problem 43 - 2012
Four cards from a set numbered 1-36 are dealt. What is the probability that they are dealt in order?

Two Girls

KS 4 Short Challenge Level:

Challenge Level:1

Weekly Problem 45 - 2012
There are 10 girls in a mixed class. If two pupils are selected, the probability that they are both girls is 0.15. How many boys are in the class?