Performing 1-Variable Statistics Calculations

After entering data into the statistics registers, you can calculate the mean and standard deviation of the data values. You can also calculate intermediate sums or check the data in the registers.

Calculating the Mean

The [ STAT ] { MN } key sequence calculates the mean (average) of the data values according to the following equation.

MN = ( ∑x ) / n

Calculating the Standard Deviation

The [ STAT ]{ s } key sequence calculates the sample ( n-1 weighted ) standard deviation according to the following equation.

sn-1 = √ ((( n∑x2 - (∑x)2) / n(n-1))

The [ STAT ][ INV ]{ s } key sequence calculates the population ( n weighted ) standard deviation according to the following equation.

sn = √ (( n∑x2 - (∑x)2) / n2

The Show Selection

The [ STAT ]{ --> }{ SHW } key sequence displays a menu that enables you to display intermediate sums or to check the data in the registers.
D_MBGvmk
{ n } - Displays number of data values
{ Sx } - Displays sum of data values
{ Sxx } - Displays sum of the squares
{ Lfr } - Displays last entered frequency
{ Lx } - Displays last entered value

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