1. 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. 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. 3 60  First, find the numerator: 1161013128 Finding the Numerator Sample = { 6, 10, 13, 11, 12, 8 } 6101311128 +++++ == x = n xx = x = n xx

4. 4 Finding the Denominator  Next, find the denominator: Sample = { 6, 10, 13, 11, 12, 8 } 123456 6 n = 6 123456 n = x = xx 60 n = x = xx 6

5. 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