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sorry - i cant see the first part of the questions
dont know the first few numbers are cut off
hold on - i got it now
for the first one Add up all the numbers and divide by 7 to get the mean for the median arrange them in ascending order. The median will be the middle value ( in this case the 4th value)
what do you get ?
3+4+6+7+9+9+11 = ?
for the mean
then I dont know what you mean by saying 4th for median
yes 0 i mean the 4th number in the list 3 4 6 7 9 9 11
oh so it would be mean= 7 and median = 7
the middle number = 7 that is the median
so here the mean and the median are equal
cool, power OS the welsh minds
now the second question is gonna be over our heads
yea well we need to keep the median and the mean equal to 7 This will give us a total of 8 numbers and the only way to make the mean and median equal is to add another 7
Alright so you think you'd add another 7, gotcha
if there is an total of numbers the median is the mean of the 'middle two'.
* an even total' i meant to say
if you add up the 8 numbers it gives 56 so mean = 56/8 = 7
ohhh ok i see
that makes sense ^
for the third one If we add an extra number at the end it makes the median 8 - because the middle 2 values will now be 7 and 9 - do you see that?
no i dont
so you saying add a 8
and that would even it out
ok, that makes it senseible
So the number I've marked X must be high enough to make the mean greater than 8 what number to you think we can make X/
we'll have b numbers and total / 8 must be greater than 8
* 8 numbers
so it could be any number greater then 8 but not 9
no - the total will b 49 + X right ?
no I thought 49 + 7
nvm I was thinking division
no X is an other number
what we must do is solve the inequlaity X + 49 ------ > 8 8 x + 49 > 64
(x + 49)/ 8 is the new mean and this has to be > 8
right so a valid number would be 16
hmmm, interesting cause I would of never of gotten by-myself... power of the welsh minds
16 by myself*
yes 16 is the number to be added