Below are the ages of husbands and wives prepare a bivariate frequency distribution with suitable width :
Here both are continuous variables form the class intervals as below :
Ages of Husbands: Highest age = 47, Lowest age = 25,
Difference = 22/(i) 5 width = 5. classes.
Ages of wife: Highest age = 47, Lowest age = 21, Difference = 26/(i)5width = 6 (Approx.) classes.
Let X and Y be the ages of Husbands and ages of Wives.