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# AQA A2 Mathematics MS2B Statistics 2B - 21st June 2016 watch

1. (Original post by Hjyu1)
I got that
How was 0.144 gained though.
2. Also I wrote for the Chi question that she should buy a diesel because there was no relationship between problems and the type of car. I was going to say she shouldn't because I've seen in past mark schemes you should always refer to observed and expected but the question said refer to your answer in part a, which I did. Sort of confused by that bit
3. (Original post by FurtherBod)
How was 0.144 gained though.
Can't remember the question but the probability per 0.1cm3 following a poison dustribution then you probs work out a probablity inequality then ....yeah u should get it
4. (Original post by Kedric123)
Also I wrote for the Chi question that she should buy a diesel because there was no relationship between problems and the type of car. I was going to say she shouldn't because I've seen in past mark schemes you should always refer to observed and expected but the question said refer to your answer in part a, which I did. Sort of confused by that bit
In part A, you worked out the expected frequencies. When is says using part a, it means use these values you worked out and compare to the observed to decide on the advice to give.

For this Q, there were more diesel engine's that had problems within the first year, (adding the first two columns), than expected, so you advise to get a petrol.

Both of the first two diesel entries, the before 3 months and within first year were greater than expected, so I don't think it would matter if you stated them separately or as one whole value, as you did combine the values in part A.

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