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Original post by kai130305

basically this is going to be a string of questions that I have to revise for year 11 I wouln't like the answers unlesss you can like explain it to me that would be great thanks xx

shoot. Or you can hmu and send me questions on snapchat and I can help you out. Im bored

Original post by ClayJensen817

shoot. Or you can hmu and send me questions on snapchat and I can help you out. Im bored

I don't have snap sorry I have a brick phone (strict parents) but I would love your help xx

Original post by kai130305

I don't have snap sorry I have a brick phone (strict parents) but I would love your help xx

coolio. Dont worry about it

Original post by ClayJensen817

coolio. Dont worry about it

okay x

Original post by kai130305

30 students in a class sat a mathematics test

the mean mark in the test for 30 students was 26.8

13 of the students in the class are boys the mean mark in the test for the boys was 25

find the mean mark for the girls

give your answer to 3 sig fig xx

the mean mark in the test for 30 students was 26.8

13 of the students in the class are boys the mean mark in the test for the boys was 25

find the mean mark for the girls

give your answer to 3 sig fig xx

Okay so the formula for mean is: total marks/number of students

Okay?

so if we use that then total marks/30 = 26.8

And there are 13 boys and 17 girls.

so total marks for boys+ total marks for girls = total marks

So total marks for boys/13 = 25

so total marks for boys = 13×25= 325

Total marks for class= 30×26.8= 804

804-325= 479 which is the total marks for girls

so mean marks for girls is 479/17 = 28.2

Okay?

Original post by ClayJensen817

Okay so the formula for mean is: total marks/number of students

Okay?

so if we use that then total marks/30 = 26.8

And there are 13 boys and 17 girls.

so total marks for boys+ total marks for girls = total marks

So total marks for boys/13 = 25

so total marks for boys = 13×25= 325

Total marks for class= 30×26.8= 804

804-325= 479 which is the total marks for girls

so mean marks for girls is 479/17 = 28.2

Okay?

Okay?

so if we use that then total marks/30 = 26.8

And there are 13 boys and 17 girls.

so total marks for boys+ total marks for girls = total marks

So total marks for boys/13 = 25

so total marks for boys = 13×25= 325

Total marks for class= 30×26.8= 804

804-325= 479 which is the total marks for girls

so mean marks for girls is 479/17 = 28.2

Okay?

you make so much more sense than my teacher thank you so its just like reversing the mean? to get the answer?

(edited 4 years ago)

Original post by kai130305

you make so much more sense than my teacher thank you so its just like reversing the mean? to get the answer?

Exactly...

and Omggggg someone told me that when I was teaching her GCSE Physics last week. YOU MADE MY DAY!!!!

OMGGGG THANK YOUUUUUU!!!!! HAHAHHAHA

I SOOOOOOOO WANNA BE A TEACHER LMAO

Original post by ClayJensen817

Exactly...

and Omggggg someone told me that when I was teaching her GCSE Physics last week. YOU MADE MY DAY!!!!

OMGGGG THANK YOUUUUUU!!!!! HAHAHHAHA

I SOOOOOOOO WANNA BE A TEACHER LMAO

and Omggggg someone told me that when I was teaching her GCSE Physics last week. YOU MADE MY DAY!!!!

OMGGGG THANK YOUUUUUU!!!!! HAHAHHAHA

I SOOOOOOOO WANNA BE A TEACHER LMAO

well your good at it xx

Original post by kai130305

well your good at it xx

hahhahahahahah

(smiles a lot)

Thank you ehem...

You can ask me Maths, Physics, Chemistry, Business studies, Economics and Further Maths GCSE stuff. I can help you out with those

Original post by kai130305

use algebra to show that the reoccurring decimal 0.345 is 19/55

the dots are on top of the 45 and the last bit is supposed to be a fraction xx

the dots are on top of the 45 and the last bit is supposed to be a fraction xx

So you use the bus stop method if you have heard of it?

19÷55

Original post by ClayJensen817

So you use the bus stop method if you have heard of it?

19÷55

19÷55

is not divide I don't think so anyway I just don't know how to put one on top of the other on this

Original post by kai130305

is not divide I don't think so anyway I just don't know how to put one on top of the other on this

In all honesty I forgot this method haha. Im doing A levels lmao

Original post by ClayJensen817

In all honesty I forgot this method haha. Im doing A levels lmao

wait is is that like that is the answer but I have to use algebra to show that??? x

Original post by kai130305

wait is is that like that is the answer but I have to use algebra to show that??? x

By algebra they mean the division method. look it up

Original post by ClayJensen817

By algebra they mean the division method. look it up

ohhhhh okay thanks x

Original post by kai130305

30 students in a class sat a mathematics test the mean mark in the test for 30 students was 26.813 of the students in the class are boys the mean mark in the test for the boys was 25find the mean mark for the girls give your answer to 3 sig fig xx

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