In the given data, the minimum age of an employee is 21 years and the maximum age is 58 years. Class length 5 is given. Therefore the lower limit (which is multiple of 5) of the initial class we will take 20 and the upper limit (which is also multiple of 5) of the last class we will take 60. Thus, the initial class and the last class of the frequency distribution will be respectively 20 – 25 and 55-60.
Continuous frequency distribution showing the age of 60 employees of an office
