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There are 10 boys and 20 girls in a class. The class has a test. The mean mark for all the class is 60 The mean mark for the girls is 54 Work out the mean mark for the boys.

The mean of the class is 60 for 30 students in total so to get the total marks scored by the class you need to multiply 60 by 30 which is 1800. Then you need to work out the total marks scored by the girl...

Answered by Thomas B. • Maths tutor

2727 Views

DNA helicase is important in DNA replication - explain why.

DNA helicase acts to unwind the 2 strands of DNA by breaking the Hydrogen bonds between them. This means that free nucleotide bases can be attracted and bind to the exposed bases.

Answered by Rachel M. • Biology tutor

9737 Views

To what extent did Tony Blair succeed in remaking the Labour Party?

First and foremost, answer the question in the introduction. There is a specific focus on 'extent', 'Tony Blair', 'succeed' and 'remaking'. Question how success and remaking was interpreted in thos...

Answered by Chelsea K. • History tutor

1009 Views

Explain why ionic compounds such as potassium sulfide have high boiling points and conduct electricity when dissolved in water?

Such compounds have high boiling points because bonds between the atoms are strong. The boiling point largely depends on electronegativity difference between the atoms - as this difference is greater, so ...

Answered by IVOR M. • Chemistry tutor

12042 Views

Explain how the differences in structure between Diamond and Graphite give rise to their different properties

Carbon has 4 electrons in its outer shell, so to fill its outer shell (which can hold up to 8 electrons) and be stable, it wants another 4 electrons. It can do this by sharing its 4 electrons in 4 strong ...

Answered by Goutham S. • Chemistry tutor

7312 Views