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Idk if this is correct?Hey!! Can someone please help me with this question. It is not a past year paper though
View attachment 59085
Thanks so much!! any help would be much appreciated
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They equated the mean after adding 100 which balanced the 100 which was subtracted earlierView attachment 59090
View attachment 59092
Ok so when a variable is added the new mean is [E(x-a)/n] + a (assume E means summation sign
So then I had read in the text book that the mean changes on adding any variable but the standard deviation is unchanged
So if the mean changes, how can we still equate them both together??
I don't think so it'll be right. Actually 0 is neither counted as positive nor negative. So if you'll exclude zero, which you might have included, I think you'll get the right answer.
Yep excluding 0 givers the right answer but since the ms says accept any of the fractions which includes the 9/13 i think they'll give 1 mark right?
Yes, you'll get only the Method Mark (M1). But not the answer mark since your answer is wrong.
You also have to add the value of 'h' to this which is 2 as the question says you to find the Maximum height above the FLOOR.
For 5) i) , in the markscheme 
the highlighted part is my doubt. Shouldn't it be just "h" ?
Oh ok yes I see! I didn't realize that there would be different orders with not all but some of the adults togetherActually you're missing some of the possible orders. You calculated that all the adults go together. But it is also possible that only 2 adults go together, and the rest do not and so on. So infact you're missing some of the possible orders.
Consider that all the adults are represented by * and children by 'x'. In order to have no 2 adults together, there must be atleast 1 children in between any two adults.
* x * x * x * x * x * x * x * x *
^ Let this represent the possible positions the adults or children can take.
There are 6 adults, so you've to select 6 ' * 's from the nine shown above where adults are to be placed.
9C6 * 6! <--- The number of different ways in which this can be done.
Now arrange the 8 children in the possible 8 arrangements shown by 'x' s. This would be 8!.
Now combine them to find the total possible orders:
9C6 * 6! * 8! = 2438553600
I hope you understood.
i was just going to post the reply to the integration question
guess you got that right?
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