Maths, Addmaths and Statistics: Post your doubts here!

[Sarah Paul]

Median is the middle number ryt? Thank You

 

[Sarah Paul]

For what do we have to find the midpoint and multiply it with the frequency? Is it for the frequency density?

 

[danial 234]

For what do we have to find the midpoint and multiply it with the frequency? Is it for the frequency density?

midpoint is used in frequency polygon or cumulative frequency polygon

 

[starship]

Can someone please EXPLAIN this to me

 

[danial 234]

Can someone please EXPLAIN this to meView attachment 27566

a )these two triangles are similar. X is a common angle. XAB =XCD. XBA=XDC. (alt angles.)
so ratio of area will be (2/5)^2

 

[danial 234]

Can someone please EXPLAIN this to meView attachment 27566

b) these two have a common height then
area ratio =0.5*h*2/0.5*h*5=2/5

 

[starship]

w 10 variant 11 Q16 too

 

[danial 234]

w 10 variant 11 Q16 too

a)3y+x=3
3y=-x+3
y=-x/3+3/3
y=-x/3 +1
m= -1/3

 

[starship]

a)3y+x=3
3y=-x+3
y=-x/3+3/3
y=-x/3 +1
m= -1/3

Which question is this?

 

[starship]

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.

 

[Kamihus]

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

 

[danial 234]

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

 

[shehri]

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

 

[areela hassan]

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???

 

[starship]

And explain lower and upper bound too

 

[danial 234]

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%

 

[areela hassan]

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 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

 

[Sikander Khan]

Can somebody help solving this! the last two parts!

 

[farhan141]

Can somebody help solving this! the last two parts!View attachment 27569

Can u tell me answers of those parts so I can tell u whether I am correct or not.

 

[farhan141]

PLEASE SOMEONE HELP ME IN CENTER OF ROTATION. PLEASE.