normal distribution

[luk3tm]

for the final maths SL exam (in just over 1 week or watever) do we have to memorize the 68.3-95.4-99.7 rule or can we just know it as the 68-95-99.7 rule, how much accuracy do we need to know this to cuz its not in the data booklet

thanks

[Abu]

You don't need to know it at all. Just keep it at the back of your head for general knowledge.

[deissi]

the what?

[Max]

the what?

The area between two standard deviations under the normal curve represents 68% of the entire area, the area between two standard deviations 95%, and between three standard deviations 99.7%.

Edited April 28, 2009 by Max

[y.v]

for the final maths SL exam (in just over 1 week or watever) do we have to memorize the 68.3-95.4-99.7 rule or can we just know it as the 68-95-99.7 rule, how much accuracy do we need to know this to cuz its not in the data booklet

thanks

I am pretty sure that you do not need to have this memorized.

However, how difficult is it anyways?

[Hedron123]

I haven't seen a question of the sort in the Maths exam though I have seen it in Biology. I agree with y.v, it's not impossible to memorise it.

[deissi]

There's no need to memorize this because standard deviation and its meaning is not discussed in SL, we just need to know the value of it.