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The question asks you to calculate the probability that 2 deviations lie outside the range -3 to 3.
I am just unsure about the probability given in the solution, i.e. the probability of an individual standardised deviation falling outside the range -3 to 3 should be approximately 2*0.00135.
Why is it 0.135%?
Does this following from comparings ISD's with standard normal, e.g. 34% should lie in (-1,0), 14% in (-2,-1) etc...
Also is it possible to get these percentages from the tables?
Thanks in advance.
I am just unsure about the probability given in the solution, i.e. the probability of an individual standardised deviation falling outside the range -3 to 3 should be approximately 2*0.00135.
Why is it 0.135%?
Does this following from comparings ISD's with standard normal, e.g. 34% should lie in (-1,0), 14% in (-2,-1) etc...
Also is it possible to get these percentages from the tables?
Thanks in advance.