Mathematics: Post your doubts here!

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vaishster

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in statistics NORMAL DISTRIBUTION FORMULA (X-mu)/sigma... u hav 2 add or subtract 0.5 to the value of X depending on the sign rite ??... but in some paper mark schemes.. they dnt do it and in some they do add or subtract 0.5 to X... how can u b sure of wen 2 do this.. its really important cuz ading or subtracting 0.5 changes the whole probalbility and the answer becomz wrong.... !!!
 
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IgoforA

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yes it's important vaishster it just that you need to remember when you change binomial to normal, you must carry out the continuity correction... method by either adding or subtracting 0.5. simple! you just need to remember if it is less than and greater orequal to you must subtract it by 0.5 and if it is less than or equal to and greater than you just need to add it by 0.5
 
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