1 Finding the Sample Mean  Given: The times, in seconds, required for a sample of students to perform a required task were: 6,  Find the sample mean x 10,13,11,12,8

2 The Formula - Knowing Its Parts  The calculation of a sample statistic requires the use of a formula. In this case, use: (Do you have your sample data ready to use?) x = xx n  x is the “sum of x”, the sum of all data n is the “sample size”, the number of data n x is “x-bar”, the sample mean xx x

3 60  First, find the numerator: Finding the Numerator Sample = { 6, 10, 13, 11, 12, 8 } == x = n xx = x = n xx

4 Finding the Denominator  Next, find the denominator: Sample = { 6, 10, 13, 11, 12, 8 } n = n = x = xx 60 n = x = xx 6

5 The Answer!  Lastly, divide and you have the answer! = n x = xx 60 6 = 10.0 The mean time is 10.0 seconds = n x = xx 60 6