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These are the selling prices of 5 houses in 2007: £145 000, £170 000, £215 000, £90 000, £180 000 (a) Work out the mean selling price.

The mean is also known as the average. To work out the mean you need to add all the house prices together and then divide by the number of houses. So in this example the total price of the houses is 145000+1...
JP
Answered by James P. • Maths tutor
3361 Views

The random variable J has a Poisson distribution with mean 4. Find P(J>2)

P(J>2) = P(J=0)+P(J=1) [split it up] P(X=t)= (V^t)/t!*e^V where V=4 in this case [use the formula] P(J>2) = 4^0/0!*e^4 + 4^1/1!*e^4 =1/e^4 + 4/e^4 = 5e^-4 which is roughly 0.0916
NC
Answered by Nathan C. • Maths tutor
4625 Views

Explain how changing one base in a DNA sequence may result in a non-functional protein being produced.

Changing one DNA base will alter one triplet in the DNA code. As each triplet codes for an amino acid this may result in a change to the primary structure of the protein produced. If the changed amino acid w...
EC
Answered by Emily C. • Biology tutor
16706 Views

Given 2x^2-3y^2=2, find the two values of dy/dx when x=5.

First solve for the exact point on the line by substituting 5 into the original equation. You should get y=+-4. Now implicitly differentiate the equation: 4x-6y(dy/dx)=0. Rearranging this will yield the foll...
KU
Answered by Kalid U. • Maths tutor
7703 Views

How should I answer a source based question in an exam?

When answering a source based question, you need to focus on the 5W's. By answering each of them, you will address each of the problems of a source based question. 5Ws : WHO / WHAT / WHEN / WHERE / WHY WHO :...
LW
Answered by Lucy W. • History tutor
8284 Views