Mathematics: Post your doubts here!

[holoholo]

Thank you

What is the probability of meal served on time and kitchen in a mess ?

 

[***amd***]

Yes. If there is a consistent .1 difference

i guess it will still be 2.8+3.0 / 2, no? coz there might be values between 2.9 and 3 in the data

 

[***amd***]

Thank you
View attachment 57744
What is the probability of meal served on time and kitchen in a mess ?

1/8
like u multiply total of 'meal on time' with total of 'kitchen left on mess'

 

[Anum96]

Thank you
View attachment 57744
What is the probability of meal served on time and kitchen in a mess ?

0.1

 

[holoholo]

how did you get 0.1 ?

 

[Anum96]

i guess it will still be 2.8+3.0 / 2, no? coz there might be values between 2.9 and 3 in the data

I dont think so. Just a less than sign means 3 isnt included. But if the next data value starts with 4 or 3. something then yes

 

[Anum96]

how did you get 0.1 ?

Umm I just completed the table. You get the second value of the last column by; 1 - (1/5). You get 0.8. Then you have been given the probability of kitch in a mess. Which is the third value of first column(3/5). You get the third value of second column by; 1 - (3/5). You get 0.4.
Calculate the first value of the second column. You get 0.1 (0.4 - 0.3) And then lastly, The requirement. 1/5 - 0.1 is 0.1

 

[***amd***]

1/8
like u multiply total of 'meal on time' with total of 'kitchen left on mess'

Umm I just completed the table. You get the second value of the last column by; 1 - (1/5). You get 0.8. Then you have been given the probability of kitch in a mess. Which is the third value of first column(3/5). You get the third value of second column by; 1 - (3/5). You get 0.4.
Calculate the first value of the second column. You get 0.1 (0.4 - 0.3) And then lastly, The requirement. 1/5 - 0.1 is 0.1

oh sorry i didnt see that 3/5 in the question. my bad

 

[holoholo]

if you actually calculate each probability you get a different answer. for example probability of meal served on time and kitchen is a mess = (1/5)*(3/5)=0.12. why are the answers different ?

 

[Anum96]

if you actually calculate each probability you get a different answer. for example probability of meal served on time and kitchen is a mess = (1/5)*(3/5)=0.12. why are the answers different ?

Dont take into account the whole probability. because that way your ans will include kitchen with no mess and not served on time 's probability too.

 

[***amd***]

Dont take into account the whole probability. because that way your ans will include kitchen with no mess and not served on time 's probability too.

didnt quite get you there. can u plz explain?

 

[Anum96]

didnt quite get you there. can u plz explain?

In this question, we cannot use that method since the answer will take into account 'meal not served on time' and 'kitchen with no mess' 's probability as well. We need to determine the required probability separately. In other words, question is not asking for total. I hope I'm coherent enough. :/

 

[***amd***]

In this question, we cannot use that method since the answer will take into account 'meal not served on time' and 'kitchen with no mess' 's probability as well. We need to determine the required probability separately. In other words, question is not asking for total. I hope I'm coherent enough. :/

didnt get it. Will try on it later again.
thanks btw

 

[Anum96]

didnt get it. Will try on it later again.
thanks btw

Ill try one more time
Its probably a conditional probability question :/
Because meal served on time WHEN theres mess made gives 0.1
Otherwise its what you^ are getting.

 

[***amd***]

Ill try one more time
Its probably a conditional probability question :/
Because meal served on time WHEN theres mess made gives 0.1
Otherwise its what you^ are getting.

lol. still didnt get it.
dw, I guess I'll do it when my mind gets off of my phys exam tomorrow.

 

[Anum96]

lol. still didnt get it.
dw, I guess I'll do it when my mind gets off of my phys exam tomorrow.

Lol, Okay.

 

[Magnanimous!!!]

Assalamalikum.
can anyone please help me in this question
may june 2104 paper33 question 5
Jazak Allah!!

 

[holoholo]

can you help find the midpoints ? please explain.

 

[Anum96]

can you help find the midpoints ? please explain.

Look The first data value says x is greater than(>) 0. Just greater than means we don’t have to include 0. However x is less than equal to(≤) 10. Therefore 10 is included. Hence, (1+10) /2 = 11/2

Same with rest of the values.

(11+20)/2 = 31/2

(21+30)/2 =51/2

(31+40)/2=71/2

(41+60) =101/2

 

[holoholo]

marking scheme says that the midpoints are 5, 15...