proton nmr question - please help!

The proton NMR spectrum of a chloroalkyl ketone, A, C₅H₉ClO, is shown.

The measured integration trace gives the ratio 1.2 to 1.2 to 1.2 to 1.8 for the peaks at (delta) 3.8, 2.8, 2.4 and 1.1 respectively. Refer to the spectrum and the data in the table on page 1 to answer the following questions.

How many different types of proton are present in compound A?
What is the actual ratio of the numbers of each type of proton?
The peaks at (delta) 2.4 and 1.1 arise from the presence of an alkyl group. Identify the group and explain the splitting pattern.
What can be deduced from the splitting of the peaks at (delta) 3.8 and 2.8?
Suggest the structure of compound A.

Oh, the question came from here:
http://www.chemsheets.co.uk/A2/CHEM4.11/A2.CHEM4.11.001.doc
Task 9 Question 2

CH3CH2COCH2CHCl

That's eight hydrogens I counted. I think you meant CH3CH2COCH2CH2Cl (or is that wrong)?

There are only four proton environments

You can see from the splitting (triplet, quartet) that the peaks at 1.1 and 2.4 arise from a CH3CH2

The shift at 2.4 suggests that this environment is next to the carbonyl

CH3CH2CO

Then the next triplet appears at 2.8 is coupled with the triplet at 3.8 (notice how the inner peak of each triplet 'grows' towards the other), which is shifted by the presence of the halogen.

CH3CH2COCH2CH2Cl