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How do you work out the median of a set of numbers?

The median is the middle number of a set of ordered numbers, i.e. halfway along. To find the median of the data set you should arrange the numbers into order, lowest to highest. Count equally from both ends ...
LK
Answered by Lydia K. • Maths tutor
3679 Views

Use BIDMAS to answer 2 + 7 x 10

Using BIDMAS we know that we should do multiplication before addition and therefore we would get, 7 x 10 which is 70 and then 2 + 70 which is 72.This is really important to have rule about orders of operatio...
EB
Answered by Eleanor B. • Maths tutor
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A bullet is fired horizontally from a gun at a height of 1.5m at 280m/s. Calculate the time taken for it to hit the ground. A second bullet is fired from an adjacent gun at 370m/s. Calculate the distance it travel before the first bullet hits the ground.

Time for first bullet to hit ground: s = -1.5m, u = 0ms -1 , v = ?, a = -9.81ms -2 , t = ?.s = ut + 1/2(at 2 )-1.5 = 0 + 1/2(-9.81 t 2 )9.81t 2 = 1.5 2 = 3t = sqrt(3/9.81) = 0.55s (2s.f.)Distance travelled b...
AN
Answered by Ayush N. • Physics tutor
4389 Views

Differentiate x = sinhy with respect to x

x = sinhy=> dx/dy = coshycosh 2 y - sinh 2 y = 1=> sqrt(1 + sinh 2 y) = coshythus dx/dy = sqrt(1 + sinh 2 y)and dy/dx = 1/sqrt(1 + sinh 2 y)hence dy/dx = 1/sqrt(1+x 2 )
AN
3475 Views

Given that α= 1+3i is a root of the equation z^3 - pz^2 + 18z - q = 0 where p and q are real, find the other roots, then p and q.

All coefficients of z are real, therefore one root must be the complex conjugate so β = 1-3i.It is known that Σαβ = 18 (the coefficient of z), so we can get an equation in the third root, γ, as follows: Σαβ ...
ZG
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