A-Level Statistics Edexcel S1 June 2007 5(d) : ExamSolutions

PREDICTIVE GRADES PLATFORM

☑️ Accurate grade predictions
☑️ Personalised resources and tuition
☑️ Guaranteed results or get your money back

SIGN UP FOR A 7-DAY FREE TRIAL, THEN 20% OFF.

ONLINE COURSES AT:

[BTFWMediaProject]

Hey, whilst working out the Standard Deviation; do you not have to divide mean by n aswell? Thanks alot btw

[ibrahimmansey]

wrong formula for standard deviation
you should subtract the mean before squaring.

[tomadams]

Sum of t squared f? that's new...

[Minasiu]

Why cant we use the normal eqn for standard deviation? ( sum of x^2/n) - (sum of x/n)^2 ?

[samadhiseneviratne]

hey, there a quick way to get the totals of the columns .. like a stat function from the calculator ?