Find the mean and variance for each of the data in Exercise.

First 10 multiples of 3


The 10 multiples of 3 are:


3, 6, 9, 12, 15, 18, 21, 24, 27, 30


We know that Mean,


Where n = number of observations and = Sum of total observations



From the given data, we can form the table:



We know that Variance, σ2 =


σ2 = (1/10) × 742.5 = 74.25


Ans. Mean = 16.5 and Variance = 74.25


3
1