Question 1189027: A sample of 2,500 people was asked how many cups of coffee they drink in the morning. You are given the following sample information.
Cups of Coffee Frequency
0 700
1 900
2 600
3 300
2,500
The variance of the number of cups of coffee is _____.
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website!
0+900+1200+900=3000 cups divided by 2500 people=1.2 cups for the mean,
Variance is sum of squared deviations from the mean
1.44*700+0.04*900+0.64*600+3.24*300=2400
divide by 2500, and variance is 0.96 cups^2, calling this a population, although it is also the same for a sample.
Calculator: L1 IS 0,1,2,3; L2 is 700,900,600,300
Then 1-variable stats L1,L2 enter
|
|
|
