Can anyone solve this sum ?

@KiHjJjH said in #16:
> Dont divert the topic. Say the correct answer.
They're probably just saying that because they don't know it

@Lhinoel1234 said in #24:
> Im in 7th grade :|
me too, but i remember hearing it about 2 months ago, some where else like a problem of this. "/
(edit :in another website)

@KiHjJjH said in #16:
> Dont divert the topic. Say the correct answer.
I don't know the answer coz I don't know what standard deviation

i'm in 7th my ans is wrong

@PLSDONTCLOSEMYACC said in #1:
>
I am literally in middle school now tell me when will this come

@MrPushwood said in #23:
> Like anyone can remember 11th grade!
For me 11th was last year only!