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Maths, Addmaths and Statistics: Post your doubts here!

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For what do we have to find the midpoint and multiply it with the frequency? Is it for the frequency density?
 
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a)3y+x=3
3y=-x+3
y=-x/3+3/3
y=-x/3 +1
m= -1/3



16 Dai played three games of cricket.
His mean score was 9 runs.
His median score was 8 runs.
His highest score was 7 runs more than his lowest score.
(a) Find the number of runs he scored in each of the three games.

(b) Dai batted in a fourth game.
The mean of his four scores was 11 runs.
Find the number of runs that Dai scored in the fourth game.
 
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16 Dai played three games of cricket.
His mean score was 9 runs.
His median score was 8 runs.
His highest score was 7 runs more than his lowest score.
(a) Find the number of runs he scored in each of the three games.

(b) Dai batted in a fourth game.
The mean of his four scores was 11 runs.
Find the number of runs that Dai scored in the fourth game.
(a)total score:9*3=27
the middle score is 8 so the other two total 19
difference of 7 between them: x+x+7=19
2x=12
x=6
scores 6,8,13

(b)total score:11*4=44
difference is the score 4 fourth game:44-27=17
 
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w 10 variant 11 Q16 too
consider them as equations, then find their location. then simply follow the sign
if it is x>0 then shade the area above that line.
if it is 3y+x >3 then shade the area above that line.
if it is y<x+3 then shade below the line.
when there is greater than or equal to sign, or smaller than or equal to then the lines should be bold otherwise they should be dotted
 
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Guys examples on how to prove similar congruent triangles in papers one, to wee just write AD=AB and so? an example would be great! thanks
 
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the price of coffee has increased by 25% what percentage of coffee consumption is to be decreased so that there would be no increase in the expenditure for a household???? how to do thisZ???
 
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l
the price of coffee has increased by 25% what percentage of coffee consumption is to be decreased so that there would be no increase in the expenditure for a household???? how to do thisZ???
let c =cost a= weight of coffee
then
ca=125/100c *(xa)
ca=1.25c*(xa)
ca/1.25c=xa
a/1.25=xa
a/1.25 * 1/a=x
1/1.25=x
%age decrease= 1-1/1.25
=20%
 
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l

let c =cost a= weight of coffee
ca=125/100c *(xa)
ca=1.25c*(xa)
ca/1.25c=xa
a/1.25=xa
a/1.25 * 1/a=x
1/1.25=x
%age decrease= 1-1/1.25
=20%

thankuuuu so much:D can u help me with this one too
meiling can complete a piece of work in 12 days and suling can complete it in 18 days .findthe number of days in which both,working together will take to complete the work
 
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