OCR D2 Resource Diagram

Hi,

Could someone help me with 3iii in the Jan 2011 D2 Past paper. I cant seem to be getting the histogram in the mark scheme and it doesnt quite make sense?

Link to Paper: http://www.ocr.org.uk/Images/58145-question-paper-unit-4737-decision-mathematics-2.pdf

Link to Mark Scheme: http://www.ocr.org.uk/Images/66803-mark-scheme-unit-4737-decision-mathematics-2-january.pdf

Reply 1

ghostwalker

17

Original post by Hgdfu

Hi,

Could someone help me with 3iii in the Jan 2011 D2 Past paper. I cant seem to be getting the histogram in the mark scheme and it doesnt quite make sense?

Link to Paper: http://www.ocr.org.uk/Images/58145-question-paper-unit-4737-decision-mathematics-2.pdf

Link to Mark Scheme: http://www.ocr.org.uk/Images/66803-mark-scheme-unit-4737-decision-mathematics-2-january.pdf

I've labelled up the historgram for you and hope it makes sense.

For each activity, you need to take into account: The starting time, the duration, AND the number of workers required.

When you're building it yourself, obviously you'd put C in below part of D, etc. I've just broken it down like this as it's easier to draw, but the essential features are the same.

(edited 6 years ago)

Reply 2

username2816144

OP

7

Hi Ghost Thank you so much for your reply it makes a lot more sense now. My only issue is with E, can you just split the square like that?From my text book, I have never seen a resource diagram like that, in all the questions I have done they are all perfect blocks, thats what really stumped me. If so are we allowed to assume that it takes 1 person 1 hour to complete a task?

Thanks

Original post by ghostwalker

I've labelled up the historgram for you and hope it makes sense.

For each activity, you need to take into account: The starting time, the duration, AND the number of workers required.

When you're building it yourself, obviously you'd put C in below part of D, etc. I've just broken it down like this as it's easier to draw, but the essential features are the same.

Reply 3

ghostwalker

17

Original post by Hgdfu

Hi Ghost Thank you so much for your reply it makes a lot more sense now. My only issue is with E, can you just split the square like that?From my text book, I have never seen a resource diagram like that, in all the questions I have done they are all perfect blocks, thats what really stumped me. If so are we allowed to assume that it takes 1 person 1 hour to complete a task?

Thanks

I only labelled the blocks like that for the sake of drawing it - ir was rather time consuming.

There is no requirement for each task to be in one overall rectangle. In fact there is no requirement for all the parts relating to one task being joined together.

You cannot assume it takes 1 person 1 hour to complete a task, since you're told some task take several hours and some require several people. Although, each of the small squares represents one person for one hour on one task.

At each stage just add the appropriate number of blocks to each small column.

If you do it in order from scratch, then A and B are straight forward to put in .
Then C would be a column of height 2 in the 2 to 3 and 3 to 4 slots.

Then D would be of height 2 and go on top of C in the 2 to 3 and 3 to 4 slots, but go in at the bottom in the 4 to 5 slot. So the two parts of it are not even connected. That's fine, carry on and finish it.

It's the overall form of the historgram that is important, not how the blocks are split or joined within it.

(edited 6 years ago)

OCR D2 Resource Diagram

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