Question

A university is carrying out a survey to study the number of hours students sleep at night during exam week. A sample of 20 students was drawn, and these responses were obtained: 6.5, 5, 6, 5.5, 7, 4, 4.5, 5, 6, 5.5, 4, 7.5, 6, 7, 8, 5, 6, 6.5, 6.5, 5. What is the sample mean of the data?

Answer 1

Step One is to add up all the values
6.5+5+6+5.5+7+4+4.5+5+6+5.5+4+7.5+6+7+8+5+6+6.5+6.5+5 = 116.5


Step Two is to divide the result from step one by 20 (since there are 20 values added up)
116.5/20 = 5.825


The sample mean is 5.825