Your data is a set of positive numbers. What is the maximum value
that the standard deviation can take?
Age 16 to 18 Challenge Level:
Let $P_1$ be a plane through the points $A(2,1,0), B(1,1,1)$ and
$C(1,7,3)$ and $P_2$ be a plane through the points $A$, $B$ and
$V(x,y,z)$. Find all the points $V(x,y,z)$ such that the two planes
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice.