 Hello and welcome to the session. I am Deepika here. Let's discuss the question which says the following table gives a distribution of the lifetime of 400 neon lamps, lifetime in hours and number of lamps. Now if the lifetime is 1500 to 2000 hours, the number of lamps is 14, for 2000 to 2500 it is 56, for 2500 to 3000 it is 60, 3000 to 3500 it is 86, 3500 to 4000 it is 74 and 4000 to 3500 it is 62 and for 4500 to 5000 it is 48 of a lamp. The relative frequency is N by 2, that is the number of observations divided by 2 is greater than and nearest to N by 2. That will be our median class. In the median class we will use the formula median is equal to is the class size help of this key idea to solve the above question. So let's start the solution. Now we have given lifetime 400 neon lamps and also we have the number of the 500, 5000, 2000 it is 14, 130 into 3500 which is 2600 is 216 plus 74 which is 2500 to 5000 it is 400, 500 that is this is our median class which is a low limit which is one third size that is it is 500 is equal to above values 135000 upon this is again equal to 3000 plus now 35000 divided by 86 to 6.9 is equal to 34006, 34006.98 hours. For the above question is median life is equal to 406.98 hours. I hope the solution is clear to you. Bye and take care.